chore: clarify wording in bot-assignment-check.sh (hiero-ledger#1761)

Signed-off-by: vaibhavsingh-materialplus <Vaibhav.Singh@materialplus.io>
Signed-off-by: vaibhavsingh-materialplus <vaibhav.sing0712@gmail.com>
Co-authored-by: vaibhavsingh-materialplus <Vaibhav.Singh@materialplus.io>

Author: vbhavh

.github/scripts/bot-assignment-check.sh

@@ -81,7 +81,7 @@ Your account currently has limited assignment privileges with a maximum of **1 o
 You currently have $count open issue(s) assigned.  Please complete and merge your existing assignment before requesting a new one.
 
 **Current Restrictions:**
-- Maximum 1 open assignment at a time
+- Maximum 1 open issue assignment at a time
 - Can only be assigned to 'Good First Issue' labeled issues
 
 **How to have restrictions lifted:**

CHANGELOG.md

@@ -254,6 +254,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 - chore: update maintainer guidelines link in MAINTAINERS.md (#1605)
 - chore: update merge conflict bot message with web editor tips (#1592)
 - chore: update MAINTAINERS.md to include new maintainer Manish Dait and sort maintainers by GitHub ID. (#1691)
+- chore: clarify wording in the bot-assignment-check.sh (#1748)
 
 ### Fixed
 - Corrected broken documentation links in SDK developer training files.(#1707)