[gardening] Fix recently introduced typos.

Author: practicalswift

cmake/modules/AddSwift.cmake

@@ -1251,8 +1251,8 @@ function(add_swift_library name)
               ${SWIFTLIB_SWIFT_COMPILE_FLAGS_WATCHOS})
         elseif("${sdk}" STREQUAL "WINDOWS")
           # FIXME(SR2005) static and shared are not mutually exclusive; however
-          # since we do a single build of the sources, this doesnt work for
-          # building both simultaneously.  Effecitvely, only shared builds are
+          # since we do a single build of the sources, this doesn't work for
+          # building both simultaneously.  Effectively, only shared builds are
           # supported on windows currently.
           if(SWIFTLIB_SHARED)
             list(APPEND swiftlib_swift_compile_flags_all -D_USRDLL)

stdlib/private/StdlibUnittest/StdlibCoreExtras.swift

@@ -201,7 +201,7 @@ extension MutableCollection
       }
       if beforeI == startIndex {
         // All elements are in non-increasing order.  Reverse to form the first
-        // pemutation, where all elements are sorted (in non-increasing order).
+        // permutation, where all elements are sorted (in non-increasing order).
         reverse()
         return .formedFirstPermutation
       }

stdlib/public/SDK/Foundation/Data.swift

@@ -452,7 +452,7 @@ public struct Data : ReferenceConvertible, CustomStringConvertible, Equatable, H
     ///
     /// This will resize the data if required, to fit the entire contents of `data`.
     ///
-    /// - precondition: The bounds of `subrange` must be valid indicies of the collection.
+    /// - precondition: The bounds of `subrange` must be valid indices of the collection.
     /// - parameter subrange: The range in the data to replace. If `subrange.lowerBound == data.count && subrange.count == 0` then this operation is an append.
     /// - parameter data: The replacement data.
     public mutating func replaceSubrange(_ subrange: Range<Index>, with data: Data) {
@@ -469,7 +469,7 @@ public struct Data : ReferenceConvertible, CustomStringConvertible, Equatable, H
     ///
     /// This will resize the data if required, to fit the entire contents of `buffer`.
     ///
-    /// - precondition: The bounds of `subrange` must be valid indicies of the collection.
+    /// - precondition: The bounds of `subrange` must be valid indices of the collection.
     /// - parameter subrange: The range in the data to replace.
     /// - parameter buffer: The replacement bytes.
     public mutating func replaceSubrange<SourceType>(_ subrange: Range<Index>, with buffer: UnsafeBufferPointer<SourceType>) {
@@ -486,7 +486,7 @@ public struct Data : ReferenceConvertible, CustomStringConvertible, Equatable, H
     ///
     /// This will resize the data if required, to fit the entire contents of `newElements`.
     ///
-    /// - precondition: The bounds of `subrange` must be valid indicies of the collection.
+    /// - precondition: The bounds of `subrange` must be valid indices of the collection.
     /// - parameter subrange: The range in the data to replace.
     /// - parameter newElements: The replacement bytes.
     public mutating func replaceSubrange<ByteCollection : Collection where ByteCollection.Iterator.Element == Data.Iterator.Element>(_ subrange: Range<Index>, with newElements: ByteCollection) {