[8.15] Remove mention of (secure) settings qualifier from docs (#201900…

…) (#202074)

# Backport

This will backport the following commits from `main` to `8.15`:
- [Remove mention of (secure) settings qualifier from docs
(#201900)](#201900)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Summary\r\n\r\nRemoves mentioning `(Secure)` settings from the keystore
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BACKPORT-->

Co-authored-by: Brad White <[email protected]>

docs/setup/secure-settings.asciidoc

@@ -8,8 +8,8 @@ keystore, and the `kibana-keystore` tool to manage the settings in the keystore.
 [NOTE]
 ====
 * Run all commands as the user who runs {kib}.
-* Only the settings with the `(Secure)` qualifier should be stored in the keystore.
-   Unsupported, extraneous or invalid JSON-string settings cause {kib} to fail to start up.
+* Any valid {kib} setting can be stored in the keystore securely.
+   Unsupported, extraneous or invalid settings will cause {kib} to fail to start up.
 ====
 
 [float]