Update event_cache_size and global_factor configurations documentation (#17071)

### Pull Request Checklist

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* [x] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
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* [x] [Code
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correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/17071.doc b/changelog.d/17071.doc
new file mode 100644
index 0000000000..28773414d8
--- /dev/null
+++ b/changelog.d/17071.doc
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+Update event_cache_size and global_factor configurations documentation.