Gardening: Fix spelling mistakes in */SourceKit

* about
* and
* answering
* because
* before
* cancellation
* clear
* comment
* complete
* corresponding
* cursor
* custom
* dependencies
* doesn't
* expression
* extension
* immediately
* implementation
* implicit
* innovation
* intentionally
* occasionally
* oldest
* parameter
* property
* response
* reuseastcontext
* snapshot
* sourcekit_swift_runtime_link_flags
* synchronously
* target
* that
* unlabeled
* usefulness
* work

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

tools/SourceKit/lib/SwiftLang/SwiftDocSupport.cpp

@@ -266,7 +266,7 @@ static void initDocGenericParams(const Decl *D, DocEntityInfo &Info,
 
   // If we have a synthesized target, map from its base type into the this
   // declaration's innermost type context, or if we're dealing with the
-  // synthesized extention itself rather than a member, into its extended
+  // synthesized extension itself rather than a member, into its extended
   // nominal (the extension's own requirements shouldn't be considered in the
   // substitution).
   unsigned TypeContextDepth = 0;
@@ -1087,7 +1087,7 @@ static bool reportModuleDocInfo(CompilerInvocation Invocation,
   ASTContext &Ctx = CI.getASTContext();
   registerIDERequestFunctions(Ctx.evaluator);
 
-  // Load implict imports so that Clang importer can use it.
+  // Load implicit imports so that Clang importer can use it.
   for (auto unloadedImport :
        CI.getMainModule()->getImplicitImportInfo().AdditionalUnloadedImports) {
     (void)Ctx.getModule(unloadedImport.module.getModulePath());