spelling: revocation

Signed-off-by: Josh Soref <[email protected]>

Author: jsoref

java/ql/src/experimental/Security/CWE/CWE-299/DisabledRevocationChecking.qhelp

@@ -23,7 +23,7 @@ then revocation checking is not going to happen.</p>
 </overview>
 <recommendation>
 
-<p>An application should not disable the default revocationg checking mechanism
+<p>An application should not disable the default revocation checking mechanism
 unless it provides a custom revocation checker.</p>
 
 </recommendation>