Fail of javadoc warnings

[trask]

Currently fails with

/home/runner/work/semantic-conventions-java/semantic-conventions-java/semconv/src/main/java/io/opentelemetry/semconv/ErrorAttributes.java:39: warning: empty <p> tag
   * <p>
     ^
error: warnings found and -Werror specified
1 error
2 warnings

due to this empty <p>:

semantic-conventions-java/semconv/src/main/java/io/opentelemetry/semconv/ErrorAttributes.java

Lines 38 to 40 in d3aa5f6

	*
	* <p>
	*

I checked the rendering and it looks like we can just remove that <p> and things render the same.

[jack-berg]

I checked the rendering and it looks like we can just remove that

and things render the same.

See this related convo from when we switched to using weaver for codegen. @jsuereth ran into issues avoiding the empty <p> tags.

[trask]

I think I've fixed this in weaver (open-telemetry/weaver#474), will revisit this PR after the next weaver release