docs: correct C return annotation in stats/base/dists/rayleigh/mean

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Author: Om-A-osc

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

@@ -148,7 +148,7 @@ Returns the mean of a Rayleigh distribution.
 
 ```c
 double out = stdlib_base_dists_rayleigh_mean( 9.0 );
-// returns ~11.253
+// returns ~11.28
 ```
 
 The function accepts the following arguments: