Rollup merge of #71399 - rust-lang:cleanup-e0554, r=Dylan-DPC

Clean up E0554 explanation

r? @Dylan-DPC
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Yuki Okushi 2020-04-22 10:34:12 +09:00 committed by GitHub
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@ -1,7 +1,7 @@
Feature attributes are only allowed on the nightly release channel. Stable or
beta compilers will not comply.
Example of erroneous code (on a stable compiler):
Erroneous code example:
```ignore (depends on release channel)
#![feature(non_ascii_idents)] // error: `#![feature]` may not be used on the