Fix typo

Author: jedesah

src/compiler/scala/tools/nsc/typechecker/Namers.scala

@@ -584,7 +584,7 @@ trait Namers extends MethodSynthesis {
           // more than one hidden name, the second will not be warned.
           // So it is the position of the actual hidden name.
           //
-          // Note: java imports have precence over definitions in the same package
+          // Note: java imports have precedence over definitions in the same package
           //       so don't warn for them. There is a corresponding special treatment
           //       in the shadowing rules in typedIdent to (SI-7232). In any case,
           //       we shouldn't be emitting warnings for .java source files.