style: use consistent markup

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/nanmean/docs/repl.txt

@@ -44,7 +44,7 @@
     Parameters
     ----------
     x: ndarray
-        Input array. Must have a real-valued or generic data type.
+        Input array. Must have a real-valued or "generic" data type.
 
     out: ndarray
         Output array.