docs: data api docs functions (#44412)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Replaces "stored procedures" with "functions" for everything related to
the Data API.

## Additional context

It's not accurate to call database functions "stored procedures". It may
have been that way before Postgres 11, but now it causes confusion
because PostgREST allows functions and not stored procedures.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Standardized terminology across docs, SDK guides, CLI/config specs,
examples, UI, and config comments to use "database functions" instead of
"stored procedures".
* Updated API docs, CLI/config descriptions, Studio UI labels, help
text, empty-state and navigation copy, RPC documentation, and example
text for consistency.
* Adjusted explanatory text and error/help messages to reflect the
revised terminology.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

examples/auth/hono-full/supabase/config.toml

@@ -8,12 +8,12 @@ project_id = "hono"
 enabled = true
 # Port to use for the API URL.
 port = 54321
-# Schemas to expose in your API. Tables, views and stored procedures in this schema will get API
+# Schemas to expose in your API. Tables, views and functions in this schema will get API
 # endpoints. `public` and `graphql_public` schemas are included by default.
 schemas = ["public", "graphql_public"]
 # Extra schemas to add to the search_path of every request.
 extra_search_path = ["public", "extensions"]
-# The maximum number of rows returns from a view, table, or stored procedure. Limits payload size
+# The maximum number of rows returned from a view, table, or function. Limits payload size
 # for accidental or malicious requests.
 max_rows = 1000
 

examples/auth/nextjs-full/supabase/config.toml

@@ -6,12 +6,12 @@ project_id = "nextjs"
 enabled = true
 # Port to use for the API URL.
 port = 54321
-# Schemas to expose in your API. Tables, views and stored procedures in this schema will get API
+# Schemas to expose in your API. Tables, views and functions in this schema will get API
 # endpoints. public and storage are always included.
 schemas = ["public", "storage", "graphql_public"]
 # Extra schemas to add to the search_path of every request. public is always included.
 extra_search_path = ["public", "extensions"]
-# The maximum number of rows returns from a view, table, or stored procedure. Limits payload size
+# The maximum number of rows returned from a view, table, or function. Limits payload size
 # for accidental or malicious requests.
 max_rows = 1000