gRPC-Core.podspec: Clarify where the template is

gRPC-Core.podspec

@@ -1,8 +1,7 @@
 # GRPC CocoaPods podspec
-# This file has been automatically generated from a template file.
-# Please look at the templates directory instead.
-# This file can be regenerated from the template by running
-# tools/buildgen/generate_projects.sh
+# This file has been automatically generated from a template file. Please make modifications to
+# `templates/gRPC-Core.podspec.template` instead. This file can be regenerated from the template by
+# running `tools/buildgen/generate_projects.sh`.
 
 # Copyright 2015, Google Inc.
 # All rights reserved.
@@ -86,8 +85,9 @@ Pod::Spec.new do |s|
   # A module map is necessary for a dynamic framework to be correctly created by Cocoapods.
   s.module_map = 'include/grpc/module.modulemap'
 
-  # List of source files generated by a template. To save you from scrolling, this is the last part
-  # of the podspec.
+  # List of source files generated by a template: `templates/gRPC-Core.podspec.template`. It can be
+  # regenerated from the template by running `tools/buildgen/generate_projects.sh`.
+  # To save you from scrolling, this is the last part of the podspec.
   s.source_files = 'src/core/lib/profiling/timers.h',
                    'src/core/lib/support/backoff.h',
                    'src/core/lib/support/block_annotate.h',

templates/gRPC-Core.podspec.template

@@ -1,10 +1,9 @@
 %YAML 1.2
 --- |
   # GRPC CocoaPods podspec
-  # This file has been automatically generated from a template file.
-  # Please look at the templates directory instead.
-  # This file can be regenerated from the template by running
-  # tools/buildgen/generate_projects.sh
+  # This file has been automatically generated from a template file. Please make modifications to
+  # `templates/gRPC-Core.podspec.template` instead. This file can be regenerated from the template by
+  # running `tools/buildgen/generate_projects.sh`.
 
   # Copyright 2015, Google Inc.
   # All rights reserved.
@@ -104,8 +103,9 @@
     # A module map is necessary for a dynamic framework to be correctly created by Cocoapods.
     s.module_map = 'include/grpc/module.modulemap'
 
-    # List of source files generated by a template. To save you from scrolling, this is the last part
-    # of the podspec.
+    # List of source files generated by a template: `templates/gRPC-Core.podspec.template`. It can be
+    # regenerated from the template by running `tools/buildgen/generate_projects.sh`.
+    # To save you from scrolling, this is the last part of the podspec.
     s.source_files = ${(',\n' + 19*' ').join('\'%s\'' % f for f in grpc_files(libs))}
 
     s.private_header_files = ${(',\n' + 27*' ').join('\'%s\'' % f for f in grpc_private_headers(libs))}