[gardening] Fix recently introduced typos: "for for" → "for", "exmaple" → "example", "requiremens" → "requirements"

include/swift/SILOptimizer/Analysis/AliasAnalysis.h

@@ -37,7 +37,7 @@ namespace {
     void *T1, *T2;
   };
 
-  /// A key used for for the MemoryBehavior Analysis cache.
+  /// A key used for the MemoryBehavior Analysis cache.
   ///
   /// The two SILValue pointers are mapped to size_t indices because we need an
   /// efficient way to invalidate them (the mechanism is described below).  The

test/Prototypes/CollectionsMoveIndices.swift

@@ -130,7 +130,7 @@
 //   This design constraint needs some extra motivation, because it
 //   might not be obvious.  Preserving index validity across mutation
 //   is important for algorithms that iterate over the tree and mutate
-//   it in place, for exmaple, removing a subrange of elements between
+//   it in place, for example, removing a subrange of elements between
 //   two indices, or removing elements that don't satisfy a predicate.
 //   When implementing such an algorithm, you would typically have an
 //   index that points to the current element.  You can copy the
@@ -141,7 +141,7 @@
 //   deleted.
 //
 // It is not possible to satisfy all of these requirements at the same
-// time.  Designs that cover some of the requiremens are possible.
+// time.  Designs that cover some of the requirements are possible.
 //
 // 1. Persistent trees with O(log n) subscripting and advancing, and
 //    strict index invalidation.