align stuff

BUILDING.md

@@ -200,10 +200,10 @@ This means you will need to have external copies of these libraries available
 on your system.
 ```
 $ cmake ../.. -DgRPC_INSTALL=ON             \
-           -DgRPC_CARES_PROVIDER=package    \
-           -DgRPC_PROTOBUF_PROVIDER=package \
-           -DgRPC_SSL_PROVIDER=package      \
-           -DgRPC_ZLIB_PROVIDER=package
+              -DgRPC_CARES_PROVIDER=package    \
+              -DgRPC_PROTOBUF_PROVIDER=package \
+              -DgRPC_SSL_PROVIDER=package      \
+              -DgRPC_ZLIB_PROVIDER=package
 $ make
 $ make install
 ```