avformat/hls: correct grammatical errors of m3u8_hold_counters option

Suggested-by: Gyan <ffmpeg@gyani.pro>
Suggested-by: Rodney Baker <rodney.baker@iinet.net.au>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

doc/demuxers.texi

@@ -332,7 +332,7 @@ Maximum number of times a insufficient list is attempted to be reloaded.
 Default value is 1000.
 
 @item m3u8_hold_counters
-Maximum number of times to load m3u8 when the m3u8 dose not refresh with new segments.
+The maximum number of times to load m3u8 when it refreshes without new segments.
 Default value is 1000.
 
 @item http_persistent

libavformat/hls.c

@@ -2332,7 +2332,7 @@ static const AVOption hls_options[] = {
         INT_MIN, INT_MAX, FLAGS},
     {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
         OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
-    {"m3u8_hold_counters", "Maximum number of times requests when the m3u8 file not be refresh",
+    {"m3u8_hold_counters", "The maximum number of times to load m3u8 when it refreshes without new segments",
         OFFSET(m3u8_hold_counters), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
     {"http_persistent", "Use persistent HTTP connections",
         OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },