doc/protocols: document "srtp" protocol

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
doc/protocols: apply very minor consistency fixes
doc/decoders: Add libopencore-amrwb decoder doc

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
doc/decoders,decoders: add various missing final dots

Enhance consistency.
h264/ff_h264_check_intra_pred_mode: fix input value check

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
h264: fix size of arrays in ff_h264_check_intra_pred_mode()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>