docs: remove repeated keywords

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---

Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/bradford/pdf/package.json

@@ -56,14 +56,10 @@
     "distribution",
     "dist",
     "bradford",
-    "bradford-distribution",
-    "parameter",
-    "shape-parameter",
     "continuous",
     "skewed",
     "pdf",
     "probability",
-    "density",
-    "probability-density-function"
+    "density"
   ]
 }