Fix argument name typo in compileall docs.
diff --git a/Doc/library/compileall.rst b/Doc/library/compileall.rst
index d515d4d..55dd958 100644
--- a/Doc/library/compileall.rst
+++ b/Doc/library/compileall.rst
@@ -119,7 +119,7 @@
cases where the source file does not exist at the time the byte-code file is
executed.
- If *ra* is given, its search method is passed the full path name to the
+ If *rx* is given, its search method is passed the full path name to the
file being compiled, and if it returns a true value, the file is not
compiled and ``True`` is returned.