Improving documentation of wp_remote_safe_* and wp_http_validate_url

[benjaminpick]

Documentation seems to be ambigous and needs to be more specific. In particular, "The URL is validated to avoid redirection and request forgery attacks." can be understood as "... to avoid redirection ..." which is not what it is doing.

Trac ticket: https://core.trac.wordpress.org/ticket/61092

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[audrasjb]

committed in https://core.trac.wordpress.org/changeset/58384