Fix many typos in docs and comments

This commit corrects many typos found in scaladocs, comments and
documentation. It should reduce a bit number of PRs which fix one
typo.

There are no changes in the 'real' code except one corrected name of
a JUnit test method and some error messages in exceptions. In the case
of typos in other method or field names etc., I just skipped them.

Obviously this commit doesn't fix all existing typos. I just generated
in IntelliJ the list of potential typos and looked through it quickly.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/files/pos/t8828.scala b/test/files/pos/t8828.scala
index 92092b4dd4..182aba54c0 100644
--- a/test/files/pos/t8828.scala
+++ b/test/files/pos/t8828.scala
@@ -11,7 +11,7 @@ package inner {
   }
 
   // the trait is sealed and doWork is not 
-  // and cannot be overriden: no warning
+  // and cannot be overridden: no warning
   private[outer] sealed trait C {
     def doWork(a: A): A = a
   }