docs: update return annotation

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

Author: kgryte

lib/node_modules/@stdlib/math/base/special/fast/maxf/README.md

@@ -76,7 +76,7 @@ var v = maxf( 4.2, 3.14 );
     // returns NaN
 
     v = maxf( NaN, 3.14 );
-    // returns 3.140000104904175
+    // returns ~3.14
     ```
 
 </section>