context: fix references to "d" in WithDeadline docs
context: fix references to "d" in WithDeadline docs

Docs of WithDeadline refers to variable "d" which does not exist
in the docs.

This commit renames the time argument to "d" to make the doc work.

Change-Id: Ifd2c1be7d2e3f7dfb21cd9bb8ff7fc5039c8d3bd
Reviewed-on: https://go-review.googlesource.com/65130
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

golang/go,akutz/go,codestation/go,akutz/go,Cofyc/go,CAFxX/go,Cofyc/go,CAFxX/go,cloudflare/go,golang/go,christopher-henderson/Go,golang/go,josharian/go,golang/go,nawawi/go,codestation/go,CAFxX/go,josharian/go,josharian/go,cloudflare/go,Cofyc/go,golang/go,nawawi/go,cloudflare/go,polyverse-security/go,cloudflare/go,codestation/go,josharian/go,polyverse-security/go,cloudflare/go,CAFxX/go,codestation/go,Cofyc/go,codestation/go,Cofyc/go,CAFxX/go,cloudflare/go,akutz/go,CAFxX/go,akutz/go,Cofyc/go,codestation/go,akutz/go,golang/go,codestation/go,polyverse-security/go,polyverse-security/go,polyverse-security/go,josharian/go,akutz/go,Cofyc/go,cloudflare/go,polyverse-security/go,golang/go,polyverse-security/go,josharian/go,Cofyc/go,akutz/go,akutz/go,golang/go,nawawi/go,nawawi/go,nawawi/go,josharian/go,cloudflare/go,codestation/go,polyverse-security/go,nawawi/go,CAFxX/go,nawawi/go,CAFxX/go,josharian/go,nawawi/go