docs: fix incorrect return value in stats/base/dists/exponenetial/cdf/README.md

PR-URL: #10962

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

Author: Om-A-osc

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

@@ -159,7 +159,7 @@ Evaluates the [cumulative distribution function][cdf] (cdf) for an [exponential]
 
 ```c
 double out = stdlib_base_dists_exponential_cdf( 2.0, 0.7 );
-// returns ~0.173
+// returns ~0.753
 ```
 
 The function accepts the following arguments: