net/url: correct the documentation for PathUnescape
net/url: correct the documentation for PathUnescape

Fixes issue #26139

Change-Id: Id9a3e5c443ee175ad9add6296ed45bdf328b15a0
GitHub-Last-Rev: b3f8a8f165d15cfffd4948151eae34f95330748c
GitHub-Pull-Request: golang/go#26146
Reviewed-on: https://go-review.googlesource.com/121696
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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