chore: regens API reference docs (#889)

diff --git a/docs/dyn/cloudtrace_v1.projects.traces.html b/docs/dyn/cloudtrace_v1.projects.traces.html
index 1afb0f5..13df879 100644
--- a/docs/dyn/cloudtrace_v1.projects.traces.html
+++ b/docs/dyn/cloudtrace_v1.projects.traces.html
@@ -72,7 +72,7 @@
 
 </style>
 
-<h1><a href="cloudtrace_v1.html">Stackdriver Trace API</a> . <a href="cloudtrace_v1.projects.html">projects</a> . <a href="cloudtrace_v1.projects.traces.html">traces</a></h1>
+<h1><a href="cloudtrace_v1.html">Cloud Trace API</a> . <a href="cloudtrace_v1.projects.html">projects</a> . <a href="cloudtrace_v1.projects.traces.html">traces</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
   <code><a href="#get">get(projectId, traceId, x__xgafv=None)</a></code></p>
@@ -87,10 +87,12 @@
 <div class="method">
     <code class="details" id="get">get(projectId, traceId, x__xgafv=None)</code>
   <pre>Gets a single trace by its ID.
+In this case, getting for traces is considered an active developer method,
+even though it is technically a read-only method.
 
 Args:
-  projectId: string, ID of the Cloud project where the trace data is stored. (required)
-  traceId: string, ID of the trace to return. (required)
+  projectId: string, Required. ID of the Cloud project where the trace data is stored. (required)
+  traceId: string, Required. ID of the trace to return. (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -159,7 +161,7 @@
             # *   `/tid`
           "a_key": "A String",
         },
-        "parentSpanId": "A String", # ID of the parent span, if any. Optional.
+        "parentSpanId": "A String", # Optional. ID of the parent span, if any.
         "startTime": "A String", # Start time of the span in nanoseconds from the UNIX epoch.
         "spanId": "A String", # Identifier for the span. Must be a 64-bit integer other than 0 and
             # unique within a trace. For example, `2205310701640571284`.
@@ -172,10 +174,12 @@
 <div class="method">
     <code class="details" id="list">list(projectId, orderBy=None, startTime=None, pageSize=None, x__xgafv=None, pageToken=None, filter=None, endTime=None, view=None)</code>
   <pre>Returns of a list of traces that match the specified filter conditions.
+In this case, listing for traces is considered an active developer method,
+even though it is technically a read-only method.
 
 Args:
-  projectId: string, ID of the Cloud project where the trace data is stored. (required)
-  orderBy: string, Field used to sort the returned traces. Optional.
+  projectId: string, Required. ID of the Cloud project where the trace data is stored. (required)
+  orderBy: string, Optional. Field used to sort the returned traces.
 Can be one of the following:
 
 *   `trace_id`
@@ -190,16 +194,16 @@
 Only one sort field is permitted.
   startTime: string, Start of the time interval (inclusive) during which the trace data was
 collected from the application.
-  pageSize: integer, Maximum number of traces to return. If not specified or <= 0, the
+  pageSize: integer, Optional. Maximum number of traces to return. If not specified or &lt;= 0, the
 implementation selects a reasonable value.  The implementation may
-return fewer traces than the requested page size. Optional.
+return fewer traces than the requested page size.
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
       2 - v2 error format
   pageToken: string, Token identifying the page of results to return. If provided, use the
-value of the `next_page_token` field from a previous request. Optional.
-  filter: string, An optional filter against labels for the request.
+value of the `next_page_token` field from a previous request.
+  filter: string, Optional. A filter against labels for the request.
 
 By default, searches use prefix matching. To specify exact match, prepend
 a plus symbol (`+`) to the search term.
@@ -231,7 +235,7 @@
 *   `url:VALUE`: Equivalent to `/http/url:VALUE`.
   endTime: string, End of the time interval (inclusive) during which the trace data was
 collected from the application.
-  view: string, Type of data returned for traces in the list. Optional. Default is
+  view: string, Optional. Type of data returned for traces in the list. Default is
 `MINIMAL`.
 
 Returns:
@@ -302,7 +306,7 @@
                 # *   `/tid`
               "a_key": "A String",
             },
-            "parentSpanId": "A String", # ID of the parent span, if any. Optional.
+            "parentSpanId": "A String", # Optional. ID of the parent span, if any.
             "startTime": "A String", # Start time of the span in nanoseconds from the UNIX epoch.
             "spanId": "A String", # Identifier for the span. Must be a 64-bit integer other than 0 and
                 # unique within a trace. For example, `2205310701640571284`.