docs: fix copy and paste errors in planck/cdf README

- fix "an planck" to "a Planck" with proper capitalization
- fix lambda parameter description from "minimum support" to "shape parameter"
- add missing spaces in function signatures and calls
- fix C code formatting to match stdlib conventions
- fix missing space after decimal .5 to 0.5

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Author: Planeshifter

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

@@ -146,22 +146,22 @@ for ( i = 0; i < lambda.length; i++ ) {
 #include "stdlib/stats/base/dists/planck/cdf.h"
 ```
 
-#### stdlib_base_dists_planck_cdf( x, lambda)
+#### stdlib_base_dists_planck_cdf( x, lambda )
 
-Evaluates the cumulative distribution function (CDF) for an planck distribution.
+Evaluates the cumulative distribution function (CDF) for a Planck distribution.
 
 ```c
-double out = stdlib_base_dists_planck_cdf( 2.0, .5);
+double out = stdlib_base_dists_planck_cdf( 2.0, 0.5 );
 // returns ~0.7769
 ```
 
 The function accepts the following arguments:
 
 -   **x**: `[in] double` input value.
--   **lambda**: `[in] double` minimum support.
+-   **lambda**: `[in] double` shape parameter.
 
 ```c
-double stdlib_base_dists_planck_cdf( const double x, const double lambda);
+double stdlib_base_dists_planck_cdf( const double x, const double lambda );
 ```
 
 </section>
@@ -189,19 +189,19 @@ double stdlib_base_dists_planck_cdf( const double x, const double lambda);
 
 static double random_uniform( const double min, const double max ) {
     double v = (double)rand() / ( (double)RAND_MAX + 1.0 );
-    return min + ( v*(max-min) );
+    return min + ( v * ( max - min ) );
 }
-int main(void) {
+int main( void ) {
     double x;
     double lambda;
     double y;
     int i;
 
-    for (i = 0; i < 25; i++) {
-        x = random_uniform(-10.0, 10.0);
-        lambda = random_uniform(0.1, 5.0);
-        y = stdlib_base_dists_planck_cdf(x, lambda);
-        printf("x: %lf, lambda: %lf, F(x; lambda): %lf\n", x, lambda, y);
+    for ( i = 0; i < 25; i++ ) {
+        x = random_uniform( -10.0, 10.0 );
+        lambda = random_uniform( 0.1, 5.0 );
+        y = stdlib_base_dists_planck_cdf( x, lambda );
+        printf( "x: %lf, lambda: %lf, F(x; lambda): %lf\n", x, lambda, y );
     }
 
     return 0;