style: remove backticks

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/unary/docs/repl.txt

@@ -3,7 +3,7 @@
     Applies a unary callback to elements in an input ndarray and assigns results
     to elements in an output ndarray.
 
-    Each provided "ndarray" should be an `object` with the following properties:
+    Each provided "ndarray" should be an object with the following properties:
 
     - dtype: data type.
     - data: data buffer.