avcodec: no period after option short name

Normalise it with other options in advanced prefs.
Signed-off-by: Rafaël Carré <funman@videolan.org>

modules/codec/avcodec/avcommon.h

@@ -74,8 +74,8 @@ static inline void vlc_init_avcodec(void)
 # include <libavutil/avutil.h>
 # include <libavutil/dict.h>
 
-#define AV_OPTIONS_TEXT     "Advanced options."
-#define AV_OPTIONS_LONGTEXT "Advanced options, in the form {opt=val,opt2=val2} ."
+#define AV_OPTIONS_TEXT     "Advanced options"
+#define AV_OPTIONS_LONGTEXT "Advanced options, in the form {opt=val,opt2=val2}."
 
 static inline AVDictionary *vlc_av_get_options(const char *psz_opts)
 {