DOC: spoa/python: Fixing typos in comments

Fixing a missing letter in a comment

This patch must be backported as far as 2.0.
diff --git a/contrib/spoa_server/ps_python.c b/contrib/spoa_server/ps_python.c
index 380d5b3..fbaa414 100644
--- a/contrib/spoa_server/ps_python.c
+++ b/contrib/spoa_server/ps_python.c
@@ -591,7 +591,7 @@
 			return 0;
 		}
 
-		/* Create th value entry */
+		/* Create the value entry */
 
 		key = PY_STRING_FROM_STRING("value");
 		if (key == NULL) {