fix: update README and C example to use direct uniform generation

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/levy/pdf/README.md

@@ -113,7 +113,7 @@ y = mypdf( 20.0 );
 <!-- eslint no-undef: "error" -->
 
 ```javascript
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var EPS = require( '@stdlib/constants/float64/eps' );
 var pdf = require( '@stdlib/stats/base/dists/levy/pdf' );
 
@@ -124,9 +124,9 @@ var y;
 var i;
 
 for ( i = 0; i < 10; i++ ) {
-    mu = randu() * 10.0;
-    x = ( randu()*10.0 ) + mu;
-    c = ( randu()*10.0 ) + EPS;
+    mu = uniform( 0.0, 10.0 );
+    x = uniform( mu, mu + 10.0 );
+    c = uniform( EPS, 10.0 + EPS );
     y = pdf( x, mu, c );
     console.log( 'x: %d, µ: %d, c: %d, f(x;µ,c): %d', x, mu, c, y );
 }
@@ -219,8 +219,8 @@ int main( void ) {
 
     for ( i = 0; i < 25; i++ ) {
         mu = random_uniform( 0.0, 10.0 );
-        x = random_uniform( 0.0, 10.0 ) + mu;
-        c = random_uniform( 0.0, 20.0 ) + STDLIB_CONSTANT_FLOAT64_EPS;
+        x = random_uniform( mu, mu + 10.0 );
+        c = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 20.0 + STDLIB_CONSTANT_FLOAT64_EPS );
         y = stdlib_base_dists_levy_pdf( x, mu, c );
         printf( "x: %lf, mu: %lf, c: %lf, f(x;mu,c): %lf\n", x, mu, c, y );
     }

lib/node_modules/@stdlib/stats/base/dists/levy/pdf/examples/c/example.c

@@ -35,8 +35,8 @@ int main( void ) {
 
 	for ( i = 0; i < 25; i++ ) {
 		mu = random_uniform( 0.0, 10.0 );
-		x = random_uniform( 0.0, 10.0 ) + mu;
-		c = random_uniform( 0.0, 20.0 ) + STDLIB_CONSTANT_FLOAT64_EPS;
+		x = random_uniform( mu, mu + 10.0 );
+		c = random_uniform( STDLIB_CONSTANT_FLOAT64_EPS, 20.0 + STDLIB_CONSTANT_FLOAT64_EPS );
 		y = stdlib_base_dists_levy_pdf( x, mu, c );
 		printf( "x: %lf, mu: %lf, c: %lf, f(x;mu,c): %lf\n", x, mu, c, y );
 	}