feat: add C implementation for stats/base/dists/frechet/logpdf: fix markdown-examples-javascript files

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Author: iraandrushko

lib/node_modules/@stdlib/stats/base/dists/frechet/logpdf/README.md

@@ -71,7 +71,7 @@ y = logpdf( 0.0, 2.0, 1.0, -1.0 );
 If provided `x <= m`, the function returns `-Infinity`.
 
 ```javascript
-y = logpdf( -2.0, 2.0, 1.0, -1.0 );
+var y = logpdf( -2.0, 2.0, 1.0, -1.0 );
 // returns -Infinity
 ```