docs: Fix a stray reference to tags in the generic doxy on dicts

Signed-off-by: Martin Storsjö <martin@martin.st>

libavutil/dict.h

@@ -93,7 +93,7 @@ av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int
  * a dictionary struct is allocated and put in *pm.
  * @param key entry key to add to *pm (will be av_strduped depending on flags)
  * @param value entry value to add to *pm (will be av_strduped depending on flags).
- *        Passing a NULL value will cause an existing tag to be deleted.
+ *        Passing a NULL value will cause an existing entry to be deleted.
  * @return >= 0 on success otherwise an error code <0
  */
 int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags);