Fix javadoc syntax

Fix javadoc syntax by wrap `<` into an inline code block.

```
[WARNING] ...\google-java-format\core\src\main\java\com\google\googlejavaformat\java\JavaInputAstVisitor.java:2577: warning - invalid usage of tag <
```

Fixes #454

COPYBARA_INTEGRATE_REVIEW=#454 from sormuras:patch-1 f5583c7
PiperOrigin-RevId: 309364827

core/src/main/java/com/google/googlejavaformat/java/JavaInputAstVisitor.java

@@ -2585,7 +2585,7 @@ private void visitToDeclare(
         typeWithDims);
   }
 
-  /** Does not omit the leading '<', which should be associated with the type name. */
+  /** Does not omit the leading {@code "<"}, which should be associated with the type name. */
   protected void typeParametersRest(
       List<? extends TypeParameterTree> typeParameters, Indent plusIndent) {
     builder.open(plusIndent);