Rollup merge of #108584 - GuillaumeGomez:rustdoc-search-background, r=notriddle

Put backtick content from rustdoc search errors into a <code> elements

Some screenshots of the result:

![Screenshot from 2023-02-28 22-37-09](https://user-images.githubusercontent.com/3050060/221990290-fa84f1cf-5a64-4ce5-8433-ee36cedf4c00.png)
![Screenshot from 2023-02-28 22-36-59](https://user-images.githubusercontent.com/3050060/221990298-f8177eeb-894b-4fce-a6fc-06d17c8b7ca2.png)
![Screenshot from 2023-02-28 22-36-51](https://user-images.githubusercontent.com/3050060/221990301-41bffd64-d041-41f1-995a-983925b1fbb1.png)

You can test it [here](https://rustdoc.crud.net/imperio/rustdoc-search-background/foo/index.html?search=%22).

r? ```@notriddle```

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/rustdoc-js-std/parser-errors.js b/tests/rustdoc-js-std/parser-errors.js
index f82a2472063..6c5a7770283 100644
--- a/tests/rustdoc-js-std/parser-errors.js
+++ b/tests/rustdoc-js-std/parser-errors.js
@@ -67,7 +67,7 @@ const PARSED = [
         returned: [],
         typeFilter: -1,
         userQuery: "a<\"p\">",
-        error: "`\"` cannot be used in generics",
+        error: "Unexpected `\"` in generics",
     },
     {
         elems: [],
@@ -373,7 +373,7 @@ const PARSED = [
         returned: [],
         typeFilter: -1,
         userQuery: "a!a",
-        error: '`!` can only be at the end of an ident',
+        error: 'Unexpected `!`: it can only be at the end of an ident',
     },
     {
         elems: [],