Update stderr

Author: mu001999

tests/ui/cfg/path-kw-as-cfg-pred.stderr

@@ -213,7 +213,7 @@ LL | #[cfg_attr(true, cfg(crate))]
    |                  ^^^^-----^
    |                  |   |
    |                  |   expected a valid identifier here
-   |                  help: must be of the form: `#[cfg(predicate)]`
+   |                  help: must be of the form: `cfg(predicate)`
    |
    = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
@@ -224,7 +224,7 @@ LL | #[cfg_attr(true, cfg(super))]
    |                  ^^^^-----^
    |                  |   |
    |                  |   expected a valid identifier here
-   |                  help: must be of the form: `#[cfg(predicate)]`
+   |                  help: must be of the form: `cfg(predicate)`
    |
    = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
@@ -235,7 +235,7 @@ LL | #[cfg_attr(true, cfg(self))]
    |                  ^^^^----^
    |                  |   |
    |                  |   expected a valid identifier here
-   |                  help: must be of the form: `#[cfg(predicate)]`
+   |                  help: must be of the form: `cfg(predicate)`
    |
    = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
@@ -246,7 +246,7 @@ LL | #[cfg_attr(true, cfg(Self))]
    |                  ^^^^----^
    |                  |   |
    |                  |   expected a valid identifier here
-   |                  help: must be of the form: `#[cfg(predicate)]`
+   |                  help: must be of the form: `cfg(predicate)`
    |
    = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
@@ -439,7 +439,7 @@ LL |         #[cfg_attr(true, cfg($crate))]
    |                          ^^^^------^
    |                          |   |
    |                          |   expected a valid identifier here
-   |                          help: must be of the form: `#[cfg(predicate)]`
+   |                          help: must be of the form: `cfg(predicate)`
 ...
 LL |     foo!();
    |     ------ in this macro invocation