fix javadocs for SearchExtensionSpec

Author: javanna

core/src/main/java/org/elasticsearch/plugins/SearchPlugin.java

@@ -143,9 +143,9 @@ public QuerySpec(String name, Reader<T> reader, QueryParser<T> parser) {
  /**
  * Specification of search time behavior extension like a custom {@link MovAvgModel} or {@link ScoreFunction}.
  *
- * @param W the type of the main {@link NamedWriteable} for this spec. All specs have this but it isn't always *for* the same thing
+ * @param <W> the type of the main {@link NamedWriteable} for this spec. All specs have this but it isn't always *for* the same thing
  * though, usually it is some sort of builder sent from the coordinating node to the data nodes executing the behavior
- * @param P the type of the parser for this spec. The parser runs on the coordinating node, converting {@link XContent} into the
+ * @param <P> the type of the parser for this spec. The parser runs on the coordinating node, converting {@link XContent} into the
  * behavior to execute
  */
  class SearchExtensionSpec<W extends NamedWriteable, P> {