Remove double punctuation. Change "contrained" wording to "constraint".

doc/manual/procs.txt

@@ -539,7 +539,7 @@ Closure iterators have other restrictions than inline iterators:
 1. ``yield`` in a closure iterator can not occur in a ``try`` statement.
 2. For now, a closure iterator cannot be evaluated at compile time.
 3. ``return`` is allowed in a closure iterator (but rarely useful) and ends 
-   iteration..
+   iteration.
 4. Neither inline nor closure iterators can be recursive.
 
 Iterators that are neither marked ``{.closure.}`` nor ``{.inline.}`` explicitly

doc/manual/trmacros.txt

@@ -43,8 +43,9 @@ Fortunately Nim supports side effect analysis:
   
   echo f() * 2 # not optimized ;-)
 
-You can make one overload for constrained match and without, and the constrained
-will be prioritized, and so you can handle both cases differently.
+You can make one overload matching with a constraint and one without, and the
+one with a constraint will have precedence, and so you can handle both cases
+differently.
 
 So what about ``2 * a``? We should tell the compiler ``*`` is commutative. We
 cannot really do that however as the following code only swaps arguments