Document Fix typo (#266)

Fix a typo

build/bazel/remote/logstream/v1/remote_logstream.proto

@@ -31,7 +31,7 @@ option objc_class_prefix = "RL";
 // The Log Stream API manages LogStream resources which are used to stream
 // writes and reads of an ordered sequence of bytes of unknown eventual length.
 //
-// Note that this is an API Interface and not an API Service, per the definitons
+// Note that this is an API Interface and not an API Service, per the definitions
 // at: https://cloud.google.com/apis/design/glossary
 //
 // Log Stream API supports the reading of unfinalized LogStreams either by