fix: improve suggestion text to try and eliminate low quality suggest…

…ions (#107)

## Description

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---------

Co-authored-by: Daniel Ciborowski <[email protected]>

src/gpt_review/_review.py

@@ -21,7 +21,10 @@
         {
             "flag": "SUMMARY_SUGGEST",
             "header": "Suggestions",
-            "goal": "Any suggestions for improving the changes in this PR?",
+            "goal": """
+            Provide suggestions for improving the changes in this PR.
+            If the PR has no clear issues, mention that no suggestions are needed.
+            """,
         },
     ],
     "RISK_CHECKS": [