Fix typos in comments

mkit/include/build.sh

@@ -170,11 +170,11 @@ get_version() {
     then    # we are in git repo... so we can get smart
         local lasttag=$(git tag | grep ^v | sort -V | tail -n1)
         if ! git describe --tags --exact-match HEAD >&/dev/null;
-        then    # we are not at later commit than the last tag
+        then    # we are at a later commit than the last tag
             local sha=g$(git log -1 --pretty=format:%h HEAD)
         fi
         if test "$(git diff --shortstat 2>/dev/null)" != "";
-        then    # thr tree is "dirty", i.e. has been edited
+        then    # the tree is "dirty", i.e. has been edited
             local dirty=dirty
         fi
         version=${lasttag:1}