crypto/rsa: improve the comment of PublicKey.Size
crypto/rsa: improve the comment of PublicKey.Size

Change-Id: Ic507cb740395e76d1d011a5a2f395b96c3d172a2
Reviewed-on: https://go-review.googlesource.com/105915
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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