Makefile: fix some typos.

Makefile

@@ -299,7 +299,7 @@ testrelease:
 	git checkout master
 	git branch -D testrelease
 
-# The following target makes a full release fro the stuff that is
+# The following target makes a full release for the stuff that is
 # currently on master.  Do it like this:
 #
 #   make release TAG=7.01
@@ -323,7 +323,7 @@ release:
 	git push
 	make updateweb
 
-# The following target makes a release, but from the studd that is on
+# The following target makes a release, but from the stuff that is on
 # maint, not from the stuff that is on master.  The idea is that it pushes
 # out a minor fix into a minor update, while development on master
 # already went full steam ahead.  To make a micro-relesse, cherry-pick