Version 1.3 release.

Updates CHANGELOG, version, docs.
diff --git a/docs/dyn/gmail_v1.users.threads.html b/docs/dyn/gmail_v1.users.threads.html
index 6973432..aaecfb6 100644
--- a/docs/dyn/gmail_v1.users.threads.html
+++ b/docs/dyn/gmail_v1.users.threads.html
@@ -146,7 +146,7 @@
         "sizeEstimate": 42, # Estimated size in bytes of the message.
         "threadId": "A String", # The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met:
             # - The requested threadId must be specified on the Message or Draft.Message you supply with your request.
-            # - The References and In-Reply-To headers must be set in compliance with the <a href="https://tools.ietf.org/html/rfc2822"RFC 2822 standard.
+            # - The References and In-Reply-To headers must be set in compliance with the RFC 2822 standard.
             # - The Subject headers must match.
         "labelIds": [ # List of IDs of labels applied to this message.
           "A String",
@@ -207,7 +207,7 @@
             "sizeEstimate": 42, # Estimated size in bytes of the message.
             "threadId": "A String", # The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met:
                 # - The requested threadId must be specified on the Message or Draft.Message you supply with your request.
-                # - The References and In-Reply-To headers must be set in compliance with the <a href="https://tools.ietf.org/html/rfc2822"RFC 2822 standard.
+                # - The References and In-Reply-To headers must be set in compliance with the RFC 2822 standard.
                 # - The Subject headers must match.
             "labelIds": [ # List of IDs of labels applied to this message.
               "A String",
@@ -288,7 +288,7 @@
         "sizeEstimate": 42, # Estimated size in bytes of the message.
         "threadId": "A String", # The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met:
             # - The requested threadId must be specified on the Message or Draft.Message you supply with your request.
-            # - The References and In-Reply-To headers must be set in compliance with the <a href="https://tools.ietf.org/html/rfc2822"RFC 2822 standard.
+            # - The References and In-Reply-To headers must be set in compliance with the RFC 2822 standard.
             # - The Subject headers must match.
         "labelIds": [ # List of IDs of labels applied to this message.
           "A String",
@@ -341,7 +341,7 @@
         "sizeEstimate": 42, # Estimated size in bytes of the message.
         "threadId": "A String", # The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met:
             # - The requested threadId must be specified on the Message or Draft.Message you supply with your request.
-            # - The References and In-Reply-To headers must be set in compliance with the <a href="https://tools.ietf.org/html/rfc2822"RFC 2822 standard.
+            # - The References and In-Reply-To headers must be set in compliance with the RFC 2822 standard.
             # - The Subject headers must match.
         "labelIds": [ # List of IDs of labels applied to this message.
           "A String",
@@ -394,7 +394,7 @@
         "sizeEstimate": 42, # Estimated size in bytes of the message.
         "threadId": "A String", # The ID of the thread the message belongs to. To add a message or draft to a thread, the following criteria must be met:
             # - The requested threadId must be specified on the Message or Draft.Message you supply with your request.
-            # - The References and In-Reply-To headers must be set in compliance with the <a href="https://tools.ietf.org/html/rfc2822"RFC 2822 standard.
+            # - The References and In-Reply-To headers must be set in compliance with the RFC 2822 standard.
             # - The Subject headers must match.
         "labelIds": [ # List of IDs of labels applied to this message.
           "A String",