Misc. typos

Found via `codespell`

src/Mod/Import/App/SCL/Part21.py

@@ -130,9 +130,9 @@ class Part21Parser:
             line = fp.readline()
             if not line:
                 break
-            # there may be a multline definition. In this case, we read lines until we found
+            # there may be a multiline definition. In this case, we read lines until we found
             # a ;
-            while (line.find(';') == -1): #its a multiline
+            while (line.find(';') == -1): #it's a multiline
                 line = line.replace("\n","").replace("\r","") + fp.readline()
             # parse line
             match_instance_definition = INSTANCE_DEFINITION_RE.search(line)  # id,name,attrs

src/Mod/Import/App/SCL/essa_par.py

@@ -46,7 +46,7 @@ def process_nested_parent_str2(attr_str,idx=0):
             current_param = ''
             k += progress+1
         elif ch==')':
-            #print "Down one level parenthesis: %i caracters parsed"%k
+            #print "Down one level parenthesis: %i characters parsed"%k
             params.append(current_param)
             #print "Current params:",params#k -= acc-2
             return params,k