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, 2 insertions, 2 deletions

diff --git a/spec/06-expressions.md b/spec/06-expressions.md
index afd1492744..da41651a74 100644
--- a/spec/06-expressions.md
+++ b/spec/06-expressions.md
@@ -666,7 +666,7 @@ followed by operators starting with ``|`', etc.
 
 There's one exception to this rule, which concerns
 [_assignment operators_](#assignment-operators).
-The precedence of an assigment operator is the same as the one
+The precedence of an assignment operator is the same as the one
 of simple assignment `(=)`. That is, it is lower than the
 precedence of any other operator.
 
@@ -1761,7 +1761,7 @@ trait Dynamic {
 ```
 
 Assume a selection of the form $e.x$ where the type of $e$ conforms to `scala.Dynamic`.
-Further assuming the selection is not followed by any function arguments, such an expression can be rewitten under the conditions given [here](#implicit-conversions) to:
+Further assuming the selection is not followed by any function arguments, such an expression can be rewritten under the conditions given [here](#implicit-conversions) to:
 
 ```scala
 $e$.applyDynamic("$x$")