docs: update nlp TypeScript declarations

PR-URL: #12747

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>

Author: stdlib-bot

lib/node_modules/@stdlib/nlp/docs/types/index.d.ts

@@ -74,8 +74,9 @@ interface Namespace {
 	* @param documents - document corpus
 	* @param K - number of topics
 	* @param options - options object
-	* @param options.alpha - Dirichlet hyper-parameter of topic vector theta
-	* @param options.beta - Dirichlet hyper-parameter for word vector phi
+	* @param options.alpha - Dirichlet hyper-parameter of topic vector theta (default: 50/K)
+	* @param options.beta - Dirichlet hyper-parameter for word vector phi (default: 0.1)
+	* @throws first argument must be an array of strings
 	* @throws second argument must be a positive integer
 	* @throws must provide valid options
 	* @returns model object