Fix typo in comment

Author: tamasvajk

csharp/ql/src/semmle/code/csharp/Location.qll

@@ -172,7 +172,7 @@ class Assembly extends Location, Attributable, @assembly {
   /** Gets the version of this assembly. */
   Version getVersion() { assemblies(this, _, _, _, result) }
 
-  /** Gets the compilation producing this assembly if any. */
+  /** Gets the compilation producing this assembly, if any. */
   Compilation getCompilation() { compilation_assembly(result, this) }
 
   override File getFile() { assemblies(this, result, _, _, _) }