docs: fix parameter type

Signed-off-by: Philipp Burckhardt <[email protected]>

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/cosine/mode/README.md

@@ -166,8 +166,8 @@ double out = stdlib_base_dists_cosine_mode( 0.0, 1.0 );
 
 The function accepts the following arguments:
 
--   **mu**: `[in] int` location parameter.
--   **s**: `[in] int` scale parameter.
+-   **mu**: `[in] double` location parameter.
+-   **s**: `[in] double` scale parameter.
 
 ```c
 double stdlib_base_dists_cosine_mode( const double mu, const double s );