Fix code ticks for RST.

Author: jsirois

source/key_projects.rst

@@ -539,7 +539,7 @@ files, standalone Python environments in the spirit of :ref:`virtualenv`.
 PEX files are zipapps as outlined :pep:`441` that
 make deployment of Python applications as simple as ``cp``. A single PEX
 file can support multiple target platforms and can be created from standard
-:ref:`pip`-resolvable requirements, a lockfile generated with `pex3 lock ...`
+:ref:`pip`-resolvable requirements, a lockfile generated with ``pex3 lock ...``
 or even another PEX. PEX files can optionally have tools embedded that support
 turning the PEX file into a standard venv, graphing dependencies and more.