docs(math/base/special/expm1f): sync README examples with example files

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---

Author: navyansh007

lib/node_modules/@stdlib/math/base/special/expm1f/README.md

@@ -66,7 +66,7 @@ var opts = {
 };
 var x = uniform( 100, -5.0, 5.0, opts );
 
-logEachMap( 'expm1f(%f) = %f', x, expm1f );
+logEachMap( 'e^%0.4f - 1 = %0.4f', x, expm1f );
 ```
 
 </section>
@@ -120,16 +120,18 @@ float stdlib_base_expm1f( const float x );
 
 ```c
 #include "stdlib/math/base/special/expm1f.h"
+#include <stdlib.h>
 #include <stdio.h>
 
 int main( void ) {
-    const float x[] = { -5.0f, -3.89f, -2.78f, -1.67f, -0.56f, 0.56f, 1.67f, 2.78f, 3.89f, 5.0f };
-
+    float x;
     float v;
     int i;
-    for ( i = 0; i < 10; i++ ) {
-        v = stdlib_base_expm1f( x[ i ] );
-        printf( "expm1f(%f) = %f\n", x[ i ], v );
+
+    for ( i = 0; i < 100; i++ ) {
+        x = ( ( (float)rand() / (float)RAND_MAX ) * 10.0f ) - 5.0f;
+        v = stdlib_base_expm1f( x );
+        printf( "e^%f - 1 = %f\n", x, v );
     }
 }
 ```