Deprecated functions get their own sections.

A small handful of functions got a 'Deprecated:' prefix instead in
documentation.

Change-Id: Ic151fb7d797514add66bc6465b6851b666a471bc
Reviewed-on: https://boringssl-review.googlesource.com/5825
Reviewed-by: Adam Langley <agl@google.com>
3 files changed