Fix typos

Author: odersky

docs/docs/reference/changed/implicit-conversions.md

@@ -36,7 +36,7 @@ In summary, previous code using implicit conversion parameters such as
       val x: B = a    // error under Dotty
     }
 
-is no longer legal and has to be rwritten to
+is no longer legal and has to be rewritten to
 
     def useConversion(implicit f: ImplicitConverter[A, B]) {
       val y: A = ...

docs/docs/reference/changed/implicit-resolution.md

@@ -41,6 +41,4 @@ affect implicits on the language level.
     more deeply than `i`. Previously, this would have resulted in an
     ambiguity error.
 
-[//] # todo: expand with precise rules
-
-
+[//]: # todo: expand with precise rules

docs/docs/reference/changed/structural-types.md

@@ -25,7 +25,7 @@ The most important method of a `Selectable` is `selectDynamic`: It
 takes a field name and returns the value associated with that name in
 the selectable.
 
-Assume now `r` is a value with structural type `S`.` In general `S` is
+Assume now `r` is a value with structural type `S`. In general `S` is
 of the form `C { Rs }`, i.e. it consists of a class reference `C` and
 refinement declarations `Rs`. We call a field selection `r.f`
 _structural_ if `f` is a name defined by a declaration in `Rs` whereas

docs/docs/reference/changed/type-checking.md

@@ -3,4 +3,4 @@ layout: doc-page
 title: "Changes in Type Checking"
 ---
 
-[//] # todo: fill in
+[//]: # todo: fill in

docs/docs/reference/changed/type-inference.md

@@ -3,5 +3,5 @@ layout: doc-page
 title: "Changes in Type Inference"
 ---
 
-[//] # todo: fill in
+[//]: # todo: fill in