docs: fix docstring formatting

Google APIs · copybara-github · commit 5bb0518fbf14 · 2021-11-09T15:08:06.000-08:00
Committer: @parthea PiperOrigin-RevId: 408715661
diff --git a/google/analytics/data/v1beta/data.proto b/google/analytics/data/v1beta/data.proto
@@ -87,7 +87,7 @@ message Dimension {
   // would like within the allowed character set. For example if a
   // `dimensionExpression` concatenates `country` and `city`, you could call
   // that dimension `countryAndCity`. Dimension names that you choose must match
-  // the regular expression "^[a-zA-Z0-9_]$".
+  // the regular expression `^[a-zA-Z0-9_]$`.
   //
   // Dimensions are referenced by `name` in `dimensionFilter`, `orderBys`,
   // `dimensionExpression`, and `pivots`.
@@ -152,7 +152,7 @@ message Metric {
   // within the allowed character set. For example if `expression` is
   // `screenPageViews/sessions`, you could call that metric's name =
   // `viewsPerSession`. Metric names that you choose must match the regular
-  // expression "^[a-zA-Z0-9_]$".
+  // expression `^[a-zA-Z0-9_]$`.
   //
   // Metrics are referenced by `name` in `metricFilter`, `orderBys`, and metric
   // `expression`.
