Various Shell Script Fixes and Improvements - Part One

see #4023

Closes #4051.

PiperOrigin-RevId: 177279457
diff --git a/scripts/release/relnotes.sh b/scripts/release/relnotes.sh
index 94edb04..d88ef46 100755
--- a/scripts/release/relnotes.sh
+++ b/scripts/release/relnotes.sh
@@ -100,8 +100,8 @@
   for i in "${RELNOTES_TYPES[@]}"; do
     eval "RELNOTES_${i}=()"
   done
-  for i in $@; do
-    extract_release_note $i
+  for commit in $@; do
+    extract_release_note "${commit}"
   done
 }