chore: add missing periods

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

Author: Planeshifter

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

@@ -181,8 +181,8 @@ double y = stdlib_base_dists_betaprime_mode( 1.0, 2.0 );
 
 The function accepts the following arguments:
 
--   **alpha**: `[in] double` first shape parameter
--   **beta**: `[in] double` second shape parameter
+-   **alpha**: `[in] double` first shape parameter.
+-   **beta**: `[in] double` second shape parameter.
 
 ```c
 double stdlib_base_dists_betaprime_mode( const double alpha, const double beta );