Bump dartdoc to eb90a44c54fa01f0d501bf6e861a34857d843cea

Changes:
```
> git log --format="%C(auto) %h %s" f2bb6e9..eb90a44
 https://dart.googlesource.com/dartdoc.git/+/eb90a44c Remove annotations from the features section of each element (3268)
 https://dart.googlesource.com/dartdoc.git/+/16126376 Don't show null in search results when no description (3273)
 https://dart.googlesource.com/dartdoc.git/+/3ff7aa75 Fix search arrows by using a flat list of suggestions (3271)
 https://dart.googlesource.com/dartdoc.git/+/90264fb4 Bump github/codeql-action from 2.1.35 to 2.1.36 (3270)
 https://dart.googlesource.com/dartdoc.git/+/bede500d Fix remote linking in 2.18 and 3.0.0 (3267)

```

Diff: https://dart.googlesource.com/dartdoc.git/+/f2bb6e92aa4fa76a409f301773d5be6bfda897dc~..eb90a44c54fa01f0d501bf6e861a34857d843cea/
Change-Id: I588c7858493c2f5202d552a83505c585e57416b5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/275300
Reviewed-by: Samuel Rawlins <[email protected]>
Auto-Submit: Devon Carew <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>

Author: devoncarew