refine readme

@@ -835,7 +835,7 @@ Remark:
 (1) Encoder: encoder must push RTMP stream to SRS server.
 (2) MediaSource: any media source, which can be ingest by ffmpeg.
 (3) Ingester: SRS will fork a process to run ffmpeg(or your application) 
-to ingest any input to rtmp, push to SRS. Read <a href="https://github.com/simple-rtmp-server/srs/wiki/v1_CN_Ingest">Ingest</a>.
+to ingest any input to rtmp, push to SRS. Read [Ingest][v1_CN_Ingest].
 (4) Streamer: SRS will listen for some protocol and accept stream push 
 over some protocol and remux to rtmp to SRS. Read <a href="https://github.com/simple-rtmp-server/srs/wiki/v2_CN_Streamer">Streamer</a>.
 </pre>