Update homebrew path

Author: n-studio

guides/source/command_line.md

@@ -99,7 +99,7 @@ Let's see what it put in our `config/database.yml`:
 # Install the pg driver:
 #   gem install pg
 # On macOS with Homebrew:
-#   gem install pg -- --with-pg-config=/usr/local/bin/pg_config
+#   gem install pg -- --with-pg-config=/opt/homebrew/bin/pg_config
 # On Windows:
 #   gem install pg
 #       Choose the win32 build.

railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt

@@ -3,7 +3,7 @@
 # Install the pg driver:
 #   gem install pg
 # On macOS with Homebrew:
-#   gem install pg -- --with-pg-config=/usr/local/bin/pg_config
+#   gem install pg -- --with-pg-config=/opt/homebrew/bin/pg_config
 # On Windows:
 #   gem install pg
 #       Choose the win32 build.