Fix typo in shell variable names

site/jekyll-tree.sh derives their own variables TMP and OUT_DIR
from TMPDIR (using /tmp as a default, but not touching the TMPDIR
variable). So those variables ought to be used also in the rest
of the script.

--
Change-Id: Ic62dffd36347982a34bc7c5cbabc7c9b3ada0cb7
Reviewed-on: https://bazel-review.googlesource.com/#/c/5671
MOS_MIGRATED_REVID=131583456
diff --git a/site/jekyll-tree.sh b/site/jekyll-tree.sh
index a787963..f8b28c1 100755
--- a/site/jekyll-tree.sh
+++ b/site/jekyll-tree.sh
@@ -49,7 +49,7 @@
   mkdir -p "$OUT_DIR/docs/be"
   for f in $(find "$OUT_DIR/versions/master/docs/be" -name "*.html"); do
     local filename=$(basename "$f")
-    cat > "$TMPDIR/out/docs/be/${filename}" <<EOF
+    cat > "$OUT_DIR/docs/be/${filename}" <<EOF
 ---
 layout: redirect
 redirect: docs/be/${filename}
@@ -69,7 +69,7 @@
   mkdir -p "$OUT_DIR/docs/skylark/lib"
   for f in $(find "$OUT_DIR/versions/master/docs/skylark/lib" -name "*.html"); do
     local filename=$(basename "$f")
-    cat > "$TMPDIR/out/docs/skylark/lib/${filename}" <<EOF
+    cat > "$OUT_DIR/docs/skylark/lib/${filename}" <<EOF
 ---
 layout: redirect
 redirect: docs/skylark/lib/${filename}