docs: fix C codeblocks in stats/base/dists/exponenetial/logcdf

PR-URL: #10961

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

Author: Om-A-osc

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

@@ -160,7 +160,7 @@ logEachMap( 'x: %0.4f, λ: %0.4f, ln(F(x;λ)): %0.4f', x, lambda, logcdf );
 ### Usage
 
 ```c
-#include "stdlib/stats/base/dists/exponential/cdf.h"
+#include "stdlib/stats/base/dists/exponential/logcdf.h"
 ```
 
 #### stdlib_base_dists_exponential_cdf( x, lambda )