Fix miscellaneous typos in comments that I've had in my tree for ages.

content/xul/document/src/nsXULPrototypeDocument.cpp

@@ -230,7 +230,8 @@ NS_NewXULPrototypeDocument(nsXULPrototypeDocument** aResult)
 
 // Helper method that shares a system global among all prototype documents
 // that have the system principal as their security principal.   Called by
-// nsXULPrototypeDocument::Read and nsXULPDGlobalObject::GetGlobalObject.
+// nsXULPrototypeDocument::Read and
+// nsXULPrototypeDocument::GetScriptGlobalObject.
 // This method greatly reduces the number of nsXULPDGlobalObjects and their
 // nsIScriptContexts in apps that load many XUL documents via chrome: URLs.
 

layout/generic/nsBRFrame.cpp

@@ -142,7 +142,7 @@ BRFrame::Reflow(nsPresContext* aPresContext,
 
       // We also do this in strict mode because BR should act like a
       // normal inline frame.  That line-height is used is important
-      // here for cases where the line-height is less that 1.
+      // here for cases where the line-height is less than 1.
       nsLayoutUtils::SetFontFromStyle(aReflowState.rendContext, mStyleContext);
       nsCOMPtr<nsIFontMetrics> fm;
       aReflowState.rendContext->GetFontMetrics(*getter_AddRefs(fm));