internal/poll: fix the wrong function names in comments
internal/poll: fix the wrong function names in comments

Change-Id: Ib17df2751209129ad6d1c148829625b347b702a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/361514
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Trust: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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