Fix PINS Link in Command Reference

Forgot the -

Author: Aevyz

doc/Command-Reference.md

@@ -136,7 +136,7 @@
 * [Platform Specific Commands](#platform-specific-commands)
   * [Mellanox Platform Specific Commands](#mellanox-platform-specific-commands)
   * [Barefoot Platform Specific Commands](#barefoot-platform-specific-commands)
-* [PINS](#pins-show commands)
+* [PINS](#pins-show-commands)
 * [PortChannels](#portchannels)
   * [PortChannel Show commands](#portchannel-show-commands)
   * [PortChannel Config commands](#portchannel-config-commands)