docs: Update log level of CollectionNotFoundError (#819)

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## Description
Move CollectionNotFoundError logging to be at Debug level

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/infrastructure/databases/vector/exceptions/exceptions.py

@@ -9,6 +9,6 @@ class CollectionNotFoundError(CriticalError):
         name: str = "CollectionNotFoundError",
         status_code: int = status.HTTP_422_UNPROCESSABLE_ENTITY,
         log=True,
-        log_level="ERROR",
+        log_level="DEBUG",
     ):
         super().__init__(message, name, status_code, log, log_level)