Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/surveys_v2.surveys.html b/docs/dyn/surveys_v2.surveys.html
index 13016b5..7d259bb 100644
--- a/docs/dyn/surveys_v2.surveys.html
+++ b/docs/dyn/surveys_v2.surveys.html
@@ -184,9 +184,9 @@
         },
       ],
       "wantedResponseCount": 42, # Number of responses desired for the survey.
-      "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+      "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
         "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-        "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+        "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
       },
     }</pre>
 </div>
@@ -262,9 +262,9 @@
       },
     ],
     "wantedResponseCount": 42, # Number of responses desired for the survey.
-    "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+    "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
       "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-      "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+      "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
     },
   }
 
@@ -335,9 +335,9 @@
         },
       ],
       "wantedResponseCount": 42, # Number of responses desired for the survey.
-      "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+      "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
         "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-        "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+        "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
       },
     }</pre>
 </div>
@@ -428,9 +428,9 @@
             },
           ],
           "wantedResponseCount": 42, # Number of responses desired for the survey.
-          "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+          "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
             "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-            "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+            "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
           },
         },
     ],
@@ -519,9 +519,9 @@
           },
         ],
         "wantedResponseCount": 42, # Number of responses desired for the survey.
-        "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+        "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
           "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-          "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+          "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
         },
       },
     "requestId": "A String", # Unique request ID used for logging and debugging. Please include in any error reporting or troubleshooting requests.
@@ -602,9 +602,9 @@
           },
         ],
         "wantedResponseCount": 42, # Number of responses desired for the survey.
-        "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+        "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
           "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-          "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+          "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
         },
       },
     "requestId": "A String", # Unique request ID used for logging and debugging. Please include in any error reporting or troubleshooting requests.
@@ -683,9 +683,9 @@
       },
     ],
     "wantedResponseCount": 42, # Number of responses desired for the survey.
-    "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+    "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
       "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-      "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+      "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
     },
   }
 
@@ -756,9 +756,9 @@
         },
       ],
       "wantedResponseCount": 42, # Number of responses desired for the survey.
-      "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is 'rejected'.
+      "rejectionReason": { # Message representing why the survey was rejected from review, if it was. # Reason for the survey being rejected. Only present if the survey state is rejected.
         "explanation": "A String", # A human-readable explanation of what was wrong with the survey.
-        "type": "A String", # Which category of rejection this was. See the GCS Help Center for additional details on each category.
+        "type": "A String", # Which category of rejection this was. See the  Google Surveys Help Center for additional details on each category.
       },
     }</pre>
 </div>