refine readme, fix typo

@@ -124,8 +124,8 @@ cd srs/trunk
 * Usage: How to deploy SRS on ARM?([CN][v1_CN_SampleARM], [EN][v1_EN_SampleARM])
 * Usage: How to ingest file/stream/device to SRS?([CN][v1_CN_SampleIngest], [EN][v1_EN_SampleIngest])
 * Usage: How to use SRS-HTTP-server to delivery HTTP/HLS stream?([CN][v2_CN_SampleHTTP], [EN][v2_EN_SampleHTTP])
-* Usage: How to show the demo of ([CN][v1_CN_SampleDemo], [EN][v1_EN_SampleDemo])
-* Usage: How to publish h.264 raw stream to [CN][v2_CN_SrsLibrtmp2], [EN][v2_EN_SrsLibrtmp2])
+* Usage: How to show the demo of SRS? ([CN][v1_CN_SampleDemo], [EN][v1_EN_SampleDemo])
+* Usage: How to publish h.264 raw stream to SRS? ([CN][v2_CN_SrsLibrtmp2], [EN][v2_EN_SrsLibrtmp2])
 * Usage: Solution using SRS?([CN][v1_CN_Sample], [EN][v1_EN_Sample])
 * Usage: Why SRS?([CN][v1_CN_Product], [EN][v1_EN_Product])