[Sema] Correcting comments typos

Author: LucianoPAlmeida

lib/Sema/CSBindings.cpp

@@ -1224,8 +1224,8 @@ bool TypeVariableBinding::attempt(ConstraintSystem &cs) const {
       } else if (srcLocator->directlyAt<ObjectLiteralExpr>()) {
         fix = SpecifyObjectLiteralTypeImport::create(cs, dstLocator);
       } else if (srcLocator->isKeyPathRoot()) {
-        // If we recorded a invalid key path fix, let's skip this root fix
-        // because it wouldn't produce a useful diagnostic.
+        // If we recorded an invalid key path fix, let's skip this specify root
+        // type fix because it wouldn't produce a useful diagnostic.
         auto *kpLocator = cs.getConstraintLocator(srcLocator->getAnchor());
         if (cs.hasFixFor(kpLocator, FixKind::AllowKeyPathWithoutComponents))
           return true;

lib/Sema/CSDiagnostics.cpp

@@ -6766,9 +6766,9 @@ bool InvalidEmptyKeyPathFailure::diagnoseAsError() {
   assert(KPE && KPE->hasSingleInvalidComponent() &&
          "Expected a malformed key path expression");
 
-  // String interpolation represented as key path expressions e.g. \(x),
-  // \(x, a: 1) and this is already diagnosed. So let's skip it because
-  // that is not the case for a empty key path diagnostic.
+  // If we have a string interpolation represented as key path expressions
+  // e.g. \(x), \(x, a: 1). Let's skip it because this would be already
+  // diagnosed and it is not the case for an extra empty key path diagnostic.
   auto *root = KPE->getParsedRoot();
   if (root && (isa<ParenExpr>(root) || isa<TupleExpr>(root)))
     return true;

lib/Sema/CSDiagnostics.h

@@ -2248,7 +2248,7 @@ class TrailingClosureRequiresExplicitLabel final : public FailureDiagnostic {
              const FunctionArgApplyInfo &info) const;
 };
 
-/// Diagnose situations where we have key path missing a component.
+/// Diagnose situations where we have a key path with no components.
 ///
 /// \code
 /// let _ : KeyPath<A, B> = \A

lib/Sema/CSFix.h

@@ -274,7 +274,7 @@ enum class FixKind : uint8_t {
   /// parameter in the call.
   SpecifyLabelToAssociateTrailingClosure,
 
-  /// Allow key path expressions missing component.
+  /// Allow key path expressions with no components.
   AllowKeyPathWithoutComponents,
 };
 
@@ -1961,7 +1961,7 @@ class SpecifyLabelToAssociateTrailingClosure final : public ConstraintFix {
   create(ConstraintSystem &cs, ConstraintLocator *locator);
 };
 
-/// Diagnose situations where we have key path missing a component.
+/// Diagnose situations where we have a key path with no components.
 ///
 /// \code
 /// let _ : KeyPath<A, B> = \A