docs: Use pkgsite links

[alexandear]

Tested links locally:

❯ pkgsite .2025/06/09 15:27:36 Info: go/packages.Load(["all"]) loaded 189 packages from . in 157.503625ms2025/06/09 15:27:36 Info: go/packages.Load(std) loaded 344 packages from /opt/homebrew/Cellar/go/1.24.3/libexec in 404.353584ms2025/06/09 15:27:36 Info: FetchDataSource: fetching github.com/google/go-github/v72@v0.0.02025/06/09 15:27:36 Info: FetchDataSource: fetching std@latest2025/06/09 15:27:36 Info: Listening on addr http://localhost:80802025/06/09 15:27:37 Info: FetchDataSource: fetched std@latest using *fetch.goPackagesModuleGetter in 215.236334ms with error <nil>2025/06/09 15:27:37 Info: FetchDataSource: fetched github.com/google/go-github/v72@v0.0.0 using *fetch.goPackagesModuleGetter in 563.621917ms with error <nil>

Open in a browser http://localhost:8080/github.com/google/go-github/v72@v0.0.0/github:

Also, replaced whitespaces with tabs in examples.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (8878e69) to head (0a2d303).
Report is 2 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3591 +/- ##
=======================================
Coverage 91.32% 91.32% =======================================
Files 184 184 Lines 16143 16143 =======================================
Hits 14742 14742 Misses 1227 1227 Partials 174 174 

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[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.