docs: add missing periods

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Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/levy/logpdf/README.md

@@ -183,7 +183,7 @@ double out = stdlib_base_dists_levy_logpdf( 2.0, 0.0, 1.0 );
 
 The function accepts the following arguments:
 
--   **x**: `[in] double` input value
+-   **x**: `[in] double` input value.
 -   **mu**: `[in] double` location parameter.
 -   **c**: `[in] double` scale parameter.
 

lib/node_modules/@stdlib/stats/base/dists/levy/pdf/README.md

@@ -173,7 +173,7 @@ double out = stdlib_base_dists_levy_pdf( 2.0, 0.0, 1.0 );
 
 The function accepts the following arguments:
 
--   **x**: `[in] double` input value
+-   **x**: `[in] double` input value.
 -   **mu**: `[in] double` location parameter.
 -   **c**: `[in] double` scale parameter.