doc/go1.14.html: describe the runtime/pprof change
doc/go1.14.html: describe the runtime/pprof change

golang.org/cl/204636
golang.org/cl/205097

Updates #36874

Change-Id: I773868fd027e9cc2187f0a738900f0fcb7711635
Reviewed-on: https://go-review.googlesource.com/c/go/+/216877
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

golang/go,nawawi/go,cloudflare/go,CAFxX/go,cloudflare/go,cloudflare/go,nawawi/go,nawawi/go,nawawi/go,akutz/go,golang/go,CAFxX/go,golang/go,golang/go,nawawi/go,golang/go,golang/go,akutz/go,akutz/go,CAFxX/go,cloudflare/go,akutz/go,golang/go,CAFxX/go,nawawi/go,CAFxX/go,cloudflare/go,CAFxX/go,akutz/go,cloudflare/go,cloudflare/go,CAFxX/go,akutz/go,nawawi/go,akutz/go,golang/go,cloudflare/go,akutz/go,CAFxX/go,nawawi/go