Add SBFrame.WatchLocation() to find and watch the location pointed to by
a variable usng the frame as the scope.

Add TestSetWatchpoint.py to exercise this API.  Also fix some SWIG Python
docstrings.

llvm-svn: 140914
diff --git a/lldb/scripts/Python/interface/SBModule.i b/lldb/scripts/Python/interface/SBModule.i
index 84470ab..01bf470 100644
--- a/lldb/scripts/Python/interface/SBModule.i
+++ b/lldb/scripts/Python/interface/SBModule.i
@@ -48,7 +48,7 @@
             print INDENT2 + repr(sym)
             print INDENT2 + 'symbol type: %s' % symbol_type_to_str(sym.GetType())
 
-might produce this following output:
+produces this following output:
 
     [0x0000000100001780-0x0000000100001d5c) a.out.__TEXT.__text
         id = {0x00000004}, name = 'mask_access(MaskAction, unsigned int)', range = [0x00000001000017c0-0x0000000100001870)