Update API_RELEASE_NOTES.md (#209)

API_RELEASE_NOTES.md

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+
+# **July 2024**
+### **Breaking Changes**
+  * No breaking changes
+
+### Ongoing Reminders:
+  *  Springer abstracts: Users have commented that our Public API does not show an abstract for Springer papers. This is intentional due to the requirements of our agreement with Springer.
+  *  Using multiple keys: If you need multiple keys, please contact [email protected] to coordinate with us to prevent service disruptions.
+  *  Exponential backoff required: To enhance system stability and manage the load effectively, we now require the use of exponential backoff strategies for API requests.
+
 # **June 2024**
 ### **Breaking Changes**
   * No breaking changes