Misc. typos

+ some are doxy others are just comment code.  
+ some minor whitespace and grammatical tweaks. 
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.

src/Mod/TechDraw/App/DrawViewMulti.h

@@ -60,7 +60,7 @@ public:
     App::PropertyLinkListGlobal Sources;
 
     virtual short mustExecute() const;
-    /** @name methods overide Feature */
+    /** @name methods override Feature */
     //@{
     /// recalculate the Feature
     virtual App::DocumentObjectExecReturn *execute(void) override;