Replace curly quotes with straight quotes

Curly quotes usually input from Chinese input method.
When read from english context, it makes some confusion.

Change-Id: I6209f92de2a5b136c2c16decfe5752f5c44096ff
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index e5f70d2..d0d7320 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -400,7 +400,7 @@
     Examples:
 
     * Good - ``http://example.com:1234/v2.0``
-    * Wouldn’t work -  ``http://example.com:1234/xyz/v2.0/``
+    * Wouldn't work -  ``http://example.com:1234/xyz/v2.0/``
       (adding prefix/suffix around version etc)
 
 Service Feature Configuration