feat(serverless): Update helloworld go code samples

[yashag002]

Description

Update helloworld go code samples

PLEASE DO NOT SUBMIT

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• appengine/go12x/helloworld/helloworld.go:15, tag gae_go12x_app
• appengine/go12x/helloworld/helloworld.go:20, tag gae_go12x_import
• appengine/go12x/helloworld/helloworld.go:30, tag gae_main_func
• appengine/go12x/helloworld/helloworld.go:35, tag gae_setting_port
• appengine/go12x/helloworld/helloworld.go:51, tag gae_indexHandler

You are about to delete 5 region tags.

• appengine/go11x/helloworld/helloworld.go:15, tag gae_go111_app
• appengine/go11x/helloworld/helloworld.go:20, tag gae_go111_import
• appengine/go11x/helloworld/helloworld.go:30, tag main_func
• appengine/go11x/helloworld/helloworld.go:35, tag setting_port
• appengine/go11x/helloworld/helloworld.go:51, tag indexHandler

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