Adding note on the use of the default * use in route authentication dependecies (#325)

**Related Issue(s):**
- #310

**Description:**
Using multiple authentication dependencies on a single route can cause
clashes if not done correctly (merging them). This is particularly
relevant to the default `*` route. My [pull
request](stac-utils/stac-fastapi#766) on
[stac-fastapi](https://github.com/stac-utils/stac-fastapi) to
dynamically merge multiple dependencies was rejected and I don't think
it's possible to replicate it here. So I've added a note to the
dependency documentation to try to explain what to do in this case.

**PR Checklist:**

- [x] Code is formatted and linted (run `pre-commit run --all-files`)
- [x] Tests pass (run `make test`)
- [x] Documentation has been updated to reflect changes, if applicable
- [x] Changes are added to the changelog

---------

Co-authored-by: Jonathan Healy <[email protected]>

Author: rhysrevans3

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Changed
+
+- Added note on the use of the default `*` use in route authentication dependecies. [#325](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/325)
+
 ## [v3.2.2] - 2024-12-15
 
 ### Changed

examples/auth/README.md

@@ -9,6 +9,11 @@ Authentication is an optional feature that can be enabled through [Route Depende
 Route dependencies for endpoints can enable through the `STAC_FASTAPI_ROUTE_DEPENDENCIES` 
 environment variable as a path to a JSON file or a JSON string.
 
+***NOTE: default dependencies***
+`*` can be used to match all paths. However, if used this must be the only Authentication dependency (multiple can be used through a 
+single merged dependency). Similarly, `*` can be used to match all methods with a route but must also be the only Authentication 
+dependency for that route.
+
 #### Route Dependency
 
 A Route Dependency must include `routes`, a list of at least one [Route](#routes), and `dependencies` a