_content/doc/manage-install: add a delete Go configs instruction

[heysujal]

doc/manage-install: add instruction to delete Go config files saved under a directory "go"

Modern Go versions store configuration in the user's configuration directory, under a directory named "go"
For instance, on macOS, this might be " /Library/Application Support/go"
For example, an "env" file that stores Go configuration as set by "go env -w invocations"
The docs at https://go.dev/doc/manage-install#uninstalling doesn't mention this.

Fixes golang/go#65583

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Michael Matloob:

Patch Set 4:

(3 comments)

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