Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/dyn/proximitybeacon_v1beta1.beaconinfo.html b/docs/dyn/proximitybeacon_v1beta1.beaconinfo.html
index 7e2b539..41ba21b 100644
--- a/docs/dyn/proximitybeacon_v1beta1.beaconinfo.html
+++ b/docs/dyn/proximitybeacon_v1beta1.beaconinfo.html
@@ -72,7 +72,7 @@
 
 </style>
 
-<h1><a href="proximitybeacon_v1beta1.html">Google Proximity Beacon API</a> . <a href="proximitybeacon_v1beta1.beaconinfo.html">beaconinfo</a></h1>
+<h1><a href="proximitybeacon_v1beta1.html">Proximity Beacon API</a> . <a href="proximitybeacon_v1beta1.beaconinfo.html">beaconinfo</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
   <code><a href="#getforobserved">getforobserved(body, x__xgafv=None)</a></code></p>
@@ -154,6 +154,21 @@
           { # A subset of attachment information served via the
               # `beaconinfo.getforobserved` method, used when your users encounter your
               # beacons.
+            "maxDistanceMeters": 3.14, # The distance away from the beacon at which this attachment should be
+                # delivered to a mobile app.
+                #
+                # Setting this to a value greater than zero indicates that the app should
+                # behave as if the beacon is "seen" when the mobile device is less than this
+                # distance away from the beacon.
+                #
+                # Different attachments on the same beacon can have different max distances.
+                #
+                # Note that even though this value is expressed with fractional meter
+                # precision, real-world behavior is likley to be much less precise than one
+                # meter, due to the nature of current Bluetooth radio technology.
+                #
+                # Optional. When not set or zero, the attachment should be delivered at the
+                # beacon's outer limit of detection.
             "data": "A String", # An opaque data container for client-provided data.
             "namespacedType": "A String", # Specifies what kind of attachment this is. Tells a client how to
                 # interpret the `data` field. Format is <var>namespace/type</var>, for