Remove trailing whitespace.
diff --git a/Doc/distutils/configfile.rst b/Doc/distutils/configfile.rst
index 0ccd5fd..890047c 100644
--- a/Doc/distutils/configfile.rst
+++ b/Doc/distutils/configfile.rst
@@ -63,7 +63,7 @@
--include-dirs (-I) list of directories to search for header files
--define (-D) C preprocessor macros to define
--undef (-U) C preprocessor macros to undefine
- --swig-opts list of SWIG command line options
+ --swig-opts list of SWIG command line options
[...]
Note that an option spelled :option:`--foo-bar` on the command-line is spelled