Rollup merge of #102447 - notriddle:notriddle/method-toggle, r=jsha

rustdoc: add method spacing to trait methods

More cleanup for 8846c0853d8687fda0e5f23f6687b03b243980ee, this time in trait layouts when things are collapsed.

This PR makes two changes to the appearance of trait pages:

* It adds the `method-toggle` class to method toggles on traits, making the DOM more consistent with type pages (which already have this class).

  ## Before

  ![image](https://user-images.githubusercontent.com/1593513/192914353-ed17e1eb-df1d-480b-9998-3b5e8283b0ee.png)

  ## After

  ![image](https://user-images.githubusercontent.com/1593513/192914570-bdd0f2e1-5254-4e2e-9576-a797b82b3b3b.png)

* It adds a bottom margin to docblocks nested directly in the implementors list, giving it a similar appearance to if it was nested within a toggle.

  ## Before

  ![image](https://user-images.githubusercontent.com/1593513/192914503-1c3f39d5-690f-44ec-8f11-385302477d04.png)

  ## After

  ![image](https://user-images.githubusercontent.com/1593513/192914702-cbce4b3b-5cc6-49dc-b7f8-73be9e76791c.png)

1 files changed, 2 insertions, 1 deletions

diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index ad9429464ef..e92e9137d64 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -2014,7 +2014,8 @@ in storage.js plus the media query with (min-width: 701px)
 
 .method-toggle summary,
 .implementors-toggle summary,
-.impl {
+.impl,
+#implementors-list > .docblock {
 	margin-bottom: 0.75em;
 }