fix: fixing redme error

Author: Vinit-Pandit

lib/node_modules/@stdlib/stats/base/dists/rayleigh/cdf/README.md

@@ -103,7 +103,9 @@ y = cdf( 2.0, 0.0 );
 Returns a function for evaluating the [cumulative distribution function][cdf] of a [Rayleigh][rayleigh-distribution] distribution with parameter `sigma` (scale parameter).
 
 ```javascript
-var myCDF = cdf.factory( 0.5 );
+var y;
+var myCDF;
+myCDF = cdf.factory( 0.5 );
 y = myCDF( 1.0 );
 // returns ~0.865
 
@@ -168,7 +170,7 @@ for ( i = 0; i < 10; i++ ) {
 #include "stdlib/stats/base/dists/rayleigh/cdf.h"
 ```
 
-#### stdlib_base_dists_rayleigh_cdf( x, a, b )
+#### stdlib_base_dists_rayleigh_cdf( x, sigma )
 
 Evaluates the cumulative distribution function (CDF) for an Rayleigh distribution.