Analyzer code base should use '///' doc comments #33892
Description
Effective Dart says:
For historical reasons, dartdoc supports two syntaxes of doc comments:
///(“C# style”) and/** ... */(“JavaDoc style”). We prefer///because it’s more compact./**and*/add two content-free lines to a multiline doc comment. The///syntax is also easier to read in some situations, such as when a doc comment contains a bulleted list that uses*to mark list items.If you stumble onto code that still uses the JavaDoc style, consider cleaning it up.
The analyzer codebase contains a mixture of the /// and /** ... */ syntaxes. We should clean it up so that it follows the recommendations of Effective Dart.