docs(rustc): De-emphasize --cfg/--check-cfg note

At the suggestion of @Urgau

Author: epage

src/doc/rustc/src/check-cfg.md

@@ -11,9 +11,6 @@ development process.
 In order to accomplish that goal, `rustc` accepts the `--check-cfg` flag, which specifies
 whether to check conditions and how to check them.
 
-> **Note:** No implicit expectation is added when using `--cfg`. Users are expected to
-pass all expected names and values using the _check cfg specification_.
-
 > **Note:** For interacting with this through Cargo,
 see [Cargo Specifics](check-cfg/cargo-specifics.md) page.
 
@@ -36,6 +33,9 @@ where `name` is a bare identifier (has no quotes) and each `"value"` term is a q
 string. `name` specifies the name of the condition, such as `feature` or `my_cfg`.
 `"value"` specify one of the value of that condition name.
 
+> **Note:** No implicit expectation is added when using `--cfg`. Users are expected to
+pass all expected names and values using the _check cfg specification_.
+
 When the `cfg(...)` option is specified, `rustc` will check every[^reachable]:
  - `#[cfg(name = "value")]` attribute
  - `#[cfg_attr(name = "value")]` attribute