docs: remove asterisks

Author: headlessNode

lib/node_modules/@stdlib/ndarray/map/docs/repl.txt

@@ -5,7 +5,7 @@
 
     The function accepts the following options:
 
-    - **dtype**: output ndarray data type. Defaults to match the input ndarray
+    - dtype: output ndarray data type. Defaults to match the input ndarray
         if not specified.
 
     The callback function is provided the following arguments: