cosmetics: Fix "dont" "wont" "doesnt" typos

doc/filters.texi

libavcodec/bmp.c

libavcodec/imgconvert.c

libavformat/act.c

libavformat/hls.c

libavformat/movenc.c

libavformat/mpegtsenc.c

libavformat/options_table.h

libavformat/utils.c

libavutil/file.h

libswresample/swresample.c