[storage] Update comments

As identified in I4118470462cced1d53c67a93d4f06c39f08d73a1 review,
remove filesystem-specific comments which may become out of date in the
future, as the out-of-space metrics are already generalized for each
filesystem.

Bug: 89583
Test: Comment/documentation update only, no functional change.
Change-Id: I7b1f9d621f83ab2b2ea5a0be393b718dbdb7171d
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt-registry/+/614821
Reviewed-by: Steve Fung <stevefung@google.com>
Privacy-Approval: Steve Fung <stevefung@google.com>
Commit-Queue: Brandon Castellano <bcastell@google.com>
diff --git a/fuchsia/local_storage/metrics.yaml b/fuchsia/local_storage/metrics.yaml
index c975e54..489f935 100644
--- a/fuchsia/local_storage/metrics.yaml
+++ b/fuchsia/local_storage/metrics.yaml
@@ -2553,9 +2553,6 @@
 # Used to track how many times a filesystem was successfully able to recover
 # from a volume extension failure (e.g. by force-flushing the journal).
 #
-# Currently only reported for Minfs and used to determine effectiveness of the
-# bugfix shipped as part of fxbug.dev/88364.
-#
 # Can only increase at most 1 every 5 minutes, so the daily max is 288.
 ################################################################################
 - id: 9004