Update actions.mdx change "caching" to "functionality"

As discussed in the below discord links, this should say "functionality" not "caching"

https://discord.com/channels/722131463138705510/861229287868858379/1375610573462573086

https://discord.com/channels/722131463138705510/861229287868858379/1375624315890044928

Author: klequis

src/routes/solid-router/concepts/actions.mdx

@@ -44,7 +44,7 @@ The `echo` action will act as a backend, however, it can be substituted for any
 Typically, route actions are used with some sort of solution like fetch or GraphQL.
 
 :::tip
-In [SolidStart](/solid-start) apps, it's recommended to use the [`"use server"`](/solid-start/reference/server/use-server) directive to leverage server-side caching.
+In [SolidStart](/solid-start) apps, it's recommended to use the [`"use server"`](/solid-start/reference/server/use-server) directive to leverage server-side functionality.
 :::
 
 ### Using actions