docs: rename variable

Author: kgryte

lib/node_modules/@stdlib/math/base/tools/evalpoly/docs/repl.txt

@@ -40,14 +40,14 @@
 
     Examples
     --------
-    > var polyval = {{alias}}.factory( [ 3.0, 2.0, 1.0 ] );
+    > var f = {{alias}}.factory( [ 3.0, 2.0, 1.0 ] );
 
     // 3*10^0 + 2*10^1 + 1*10^2
-    > var v = polyval( 10.0 )
+    > var v = f( 10.0 )
     123.0
 
     // 3*5^0 + 2*5^1 + 1*5^2
-    > v = polyval( 5.0 )
+    > v = f( 5.0 )
     38.0
 
     See Also