[2.7] Docs: fix some wrong words (pythonGH-6987)

Fix typos in code comments: bdb.py and configure.ac..
(cherry picked from commit b5c246f)

Co-authored-by: Eitan Adler <[email protected]>

Author: grimreaper

configure

@@ -3040,7 +3040,7 @@ if test "${enable_universalsdk+set}" = set; then :
   enableval=$enable_universalsdk;
 	case $enableval in
 	yes)
-		# Locate the best usable SDK, see Mac/README.txt for more
+		# Locate the best usable SDK, see Mac/README for more
 		# information
 		enableval="`/usr/bin/xcodebuild -version -sdk macosx Path 2>/dev/null`"
 		if ! ( echo $enableval | grep -E '\.sdk' 1>/dev/null )