bpo-32747: Remove trailing spaces in docstrings. (GH-5491)

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 3d9e09d..f5e4ab6 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -11595,7 +11595,7 @@
 PyDoc_STRVAR(index__doc__,
              "S.index(sub[, start[, end]]) -> int\n\
 \n\
-Return the lowest index in S where substring sub is found, \n\
+Return the lowest index in S where substring sub is found,\n\
 such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\