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/Tools/generateTemplates/templateClassPyExport.py

@@ -579,7 +579,7 @@ PyObject * @self.export.Name@::staticCallback_@i.Name@ (PyObject *self, PyObject
         PyErr_SetString(Base::BaseExceptionFreeCADError,e);
         return NULL;
     }
-    // in debug not all exceptions will be catched to get the attention of the developer!
+    // in debug not all exceptions will be caught to get the attention of the developer!
 #ifndef DONT_CATCH_CXX_EXCEPTIONS 
     catch(const std::exception& e) // catch other c++ exceptions
     {

src/Tools/wiki2qhelp.py

@@ -44,7 +44,7 @@ NORETRIEVE = ['Manual','Developer_hub','Power_users_hub','Users_hub','Source_doc
 GETTRANSLATIONS = True # Set true if you want to get the translations too.
 MAXFAIL = 3 # max number of retries if download fails
 VERBOSE = True # to display what's going on. Otherwise, runs totally silent.
-COMPILE = True # Wether qt assistant will be used to compile the final help file
+COMPILE = True # Whether Qt assistant will be used to compile the final help file
 OUTPUTPATH = os.path.expanduser("~")+os.sep+'.FreeCAD' # Where to store the qch file
 QHELPCOMPILER = 'qhelpgenerator'
 QCOLLECTIOMGENERATOR = 'qcollectiongenerator'