squash of - 366870749 lyra_codec/README: add note about apt update …

…by mchinen <mchinen@google.com>

PiperOrigin-RevId: 366870749
Change-Id: I06fbfde4ce99f3e46d0c81af7aca194b552eff75

README.md

@@ -48,7 +48,12 @@ target.  The android target is optimized for realtime performance.  The linux
 target is typically used for development and debugging.
 
 You will also need to install some tools (which may already be on your system).
-You can install them with `sudo apt install ninja-build git cmake clang python`.
+You can install them with:
+
+```shell
+sudo apt update
+sudo apt install ninja-build git cmake clang python
+```
 
 ### Linux requirements