docs: apply suggestions from code review

Signed-off-by: Muhammad Haris <[email protected]>

Author: headlessNode

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

@@ -61,18 +61,14 @@ If the function is unable to find a search element, the function returns `-1`.
 var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
 var ndarray = require( '@stdlib/ndarray/base/ctor' );
 
-var xbuf = [ 1.0, 3.0, 4.0, 2.0 ];
-var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
-
-var searchElement = scalar2ndarray( 10.0, {
-    'dtype': 'generic'
-});
+function isEven( v ) {
+    return v % 2.0 === 0.0;
+}
 
-var fromIndex = scalar2ndarray( 0, {
-    'dtype': 'generic'
-});
+var xbuf = [ 1.0, 3.0, 5.0, 7.0 ];
+var x = new ndarray( 'generic', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );
 
-var idx = gfindIndex( [ x, searchElement, fromIndex ] );
+var idx = gfindIndex( [ x ], isEven );
 // returns -1
 ```