docs: remove backticks

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Author: kgryte

lib/node_modules/@stdlib/stats/incr/nanmsum/README.md

@@ -53,7 +53,7 @@ var incrnanmsum = require( '@stdlib/stats/incr/nanmsum' );
 
 #### incrnanmsum( window )
 
-Returns an accumulator `function` which incrementally computes a moving sum. The `window` parameter defines the number of values over which to compute the moving sum.
+Returns an accumulator function which incrementally computes a moving sum. The `window` parameter defines the number of values over which to compute the moving sum.
 
 ```javascript
 var accumulator = incrnanmsum( 3 );