gopls/doc: improve troubleshooting docs with specifics
gopls/doc: improve troubleshooting docs with specifics

Add the exact VS Code settings that users need to capture valuable logs.

Change-Id: If6b4874d1d3beab2fa6da054615dd7973b6e3fa9
Reviewed-on: https://go-review.googlesource.com/c/tools/+/214940
Reviewed-by: Heschi Kreinick <e89ab2b172855aa0ad01c40c4d8a3535a61ac68a@google.com>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools