net: fix typo in ParseCIDR doc
net: fix typo in ParseCIDR doc

Fixes #19891

Change-Id: I2f2684dd5fbfcf93fca0f2c3caf678f44605687f
Reviewed-on: https://go-review.googlesource.com/40090
Reviewed-by: Mikio Hara <e2f4d2eec1d9a1f781345cdd7260d7d52e6468ae@gmail.com>
Run-TryBot: Mikio Hara <e2f4d2eec1d9a1f781345cdd7260d7d52e6468ae@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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