chore: fix example

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---

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/base/ndarray/gfind-index/README.md

@@ -100,7 +100,7 @@ var ctx = {
     'count': 0
 };
 
-var v = gfindIndex( [ x ], clbk, ctx );
+var v = gfindIndex( [ x ], isEven, ctx );
 // returns 2
 
 var count = ctx.count;
@@ -115,8 +115,8 @@ var count = ctx.count;
 
 ## Notes
 
--  If provided an empty one-dimensional ndarray, the function returns `-1`.
--  A provided callback function should return a boolean value.
+-   If provided an empty one-dimensional ndarray, the function returns `-1`.
+-   A provided callback function should return a boolean value.
 
 </section>