message: Fixed Build NSS command on Linux build document
diff: @@ -113,7 +113,7 @@ export LD_LIBRARY_PATH=$NSS_DIR/../dist/Debug/lib
  5. Clone **NSS** and **NSPR**
  ```shell
  -hg clone -u c7a1c91cd9be https://hg.mozilla.org/projects/nss "$NSS_DIR"
  +hg clone https://hg.mozilla.org/projects/nss "$NSS_DIR"
  hg clone -u NSPR_4_25_RTM https://hg.mozilla.org/projects/nspr "$NSPR_DIR"
  ```
  