docs: clarify which generators use the attribute syntax (#2510)

The Code Generation guide had an "Attribute syntax" section that read
"Most generators accept a trailing list of name:type pairs" without
naming which ones. Readers reasonably parsed the table that followed
as global-to-all-generators (because it precedes every per-subcommand
Synopsis), then got confused when the table didn't apply to e.g.
generate controller or generate test (issue #2466).

Make the boundary explicit:

- List the four property-aware generators (model, scaffold,
  api-resource, property) in the lead paragraph.
- Call out that the other generators take positional args
  documented per-subcommand below.

No structural change — every per-subcommand Synopsis already
documented the right arguments. The lead paragraph just makes the
grouping unambiguous.

Resolves #2466.

Co-authored-by: Claude <noreply@anthropic.com>

Author: bpamiri

web/sites/guides/src/content/docs/v4-0-0-snapshot/command-line-tools/wheels-commands/code-generation.mdx

@@ -47,7 +47,9 @@ Running `wheels generate` with no arguments prints the list of supported types a
 
 ## Attribute syntax
 
-Most generators accept a trailing list of `name:type` property pairs after the resource name. The parser also recognises a few `--belongsTo=`, `--hasMany=`, and `--hasOne=` flags for associations. Type names are normalised to Wheels migration column types — unknown types fall back to `string`.
+Property-aware generators — `model`, `scaffold`, `api-resource`, and `property` — accept a trailing list of `name:type` property pairs after the resource name. They also recognise `--belongsTo=`, `--hasMany=`, and `--hasOne=` flags for associations. Type names are normalised to Wheels migration column types — unknown types fall back to `string`.
+
+The other generators (`controller`, `view`, `migration`, `route`, `test`, `helper`, `snippets`, `admin`) take their own positional arguments — see the per-subcommand Synopsis sections below for what each accepts.
 
 | You write | Column type | Notes |
 |---|---|---|