Fix a typo in documentation (issue #213).

--HG--
branch : distribute
extra : rebase_source : 66aec4b4380512e96e64285421eae404013964e1

docs/python3.txt

@@ -66,7 +66,7 @@ and no conversion will happen.
 
 In general, if code doesn't seem to be converted, deleting the build directory
 and trying again is a good saferguard against the build directory getting
-"out of sync" with teh source directory.
+"out of sync" with the source directory.
 
 Distributing Python 3 modules
 =============================