x/tools/gopls/internal/doc/generate: TestGenerated failures

[gopherbot]

#!watchflakes
default <- pkg == "golang.org/x/tools/gopls/internal/doc/generate" && test == "TestGenerated"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestGenerated
    generate_test.go:19: C:\Users\swarming\.swarming\w\ir\x\w\goroot\bin\go.exe list -f {{.Dir}} golang.org/x/tools/gopls: exit status 1
        error obtaining VCS status: exit status 128
        	Use -buildvcs=false to disable VCS stamping.
        
--- FAIL: TestGenerated (6.07s)

— watchflakes