chore: added period in readme

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Author: 0PrashantYadav0

lib/node_modules/@stdlib/stats/base/dists/discrete-uniform/stdev/README.md

@@ -176,8 +176,8 @@ double out = stdlib_base_dists_discrete_uniform_stdev( 0, 1 );
 
 The function accepts the following arguments:
 
--   **a**: `[in] int32_t` location parameter
--   **b**: `[in] int32_t` scale parameter
+-   **a**: `[in] int32_t` location parameter.
+-   **b**: `[in] int32_t` scale parameter.
 
 ```c
 double stdlib_base_dists_discrete_uniform_stdev( const int32_t a, const int32_t b );