Typos, grammar & uniformiity

3rd party KDL typos have been submitted upstream https://github.com/orocos/orocos_kinematics_dynamics/pull/121

src/Mod/Spreadsheet/importXLSX.py

@@ -158,7 +158,7 @@ tokenDic = {
 
 class exprNode(object):
   ''' This defines a tree class for expression parsing.
-  A tree is build, to step down into the levels of the expression.'''   
+  A tree is built, to step down into the levels of the expression.'''   
   def __init__(self, parent, state, actIndex):
     self.state = state #see comment: State used for Angle-functions and IF-function
     self.parent = parent # Parent tree node