math/bits: add examples for leading zero methods
math/bits: add examples for leading zero methods

Change-Id: Ib491d144387a7675af370f7b925fe6e62440d153
Reviewed-on: https://go-review.googlesource.com/48966
Run-TryBot: Kevin Burke <685caccd7011cfe58b8f9ef79ff9dca388f03c79@inburke.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Kevin Burke <685caccd7011cfe58b8f9ef79ff9dca388f03c79@inburke.com>

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