docs: update comments

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/strided/covarmtk/lib/accessors.js

@@ -60,11 +60,11 @@ function covarmtk( N, correction, meanx, x, strideX, offsetX, meany, y, strideY,
 	var n;
 	var i;
 
-	// Cache reference to array data:
+	// Cache references to array data:
 	xbuf = x.data;
 	ybuf = y.data;
 
-	// Cache a reference to the element accessor:
+	// Cache references to element accessors:
 	xget = x.accessors[ 0 ];
 	yget = y.accessors[ 0 ];