docs: fix types

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---

Author: kgryte

lib/node_modules/@stdlib/dstructs/struct/lib/main.js

@@ -278,7 +278,7 @@ function factory( fields ) {
 	* @name alignment
 	* @memberof Struct
 	* @readonly
-	* @type {NonNegativeInteger}
+	* @type {PositiveInteger}
 	*/
 	setReadOnly( Struct, 'alignment', ALIGNMENT );
 
@@ -289,7 +289,7 @@ function factory( fields ) {
 	* @name byteLength
 	* @memberof Struct
 	* @readonly
-	* @type {NonNegativeInteger}
+	* @type {PositiveInteger}
 	*/
 	setReadOnly( Struct, 'byteLength', BYTE_LENGTH );