Rollup merge of #112927 - GuillaumeGomez:where-clause-indent, r=notriddle

Fix indentation for where clause in rustdoc pages

Screenshot of the bug:

![image](https://github.com/rust-lang/rust/assets/3050060/090cfeaa-0edc-46c7-9ea0-e26ac865b2c2)

I used this opportunity to clarify the code a bit because some weird things were going on.

r? ````@notriddle````

src/librustdoc/html/render/mod.rs

@@ -860,8 +860,8 @@ fn assoc_method(
     w.reserve(header_len + "<a href=\"\" class=\"fn\">{".len() + "</a>".len());
     write!(
         w,
-        "{indent}{vis}{constness}{asyncness}{unsafety}{defaultness}{abi}fn <a{href} class=\"fn\">{name}</a>\
-         {generics}{decl}{notable_traits}{where_clause}",
+        "{indent}{vis}{constness}{asyncness}{unsafety}{defaultness}{abi}fn \
+         <a{href} class=\"fn\">{name}</a>{generics}{decl}{notable_traits}{where_clause}",
         indent = indent_str,
         vis = vis,
         constness = constness,