docs: add note

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/pop/README.md

@@ -68,7 +68,7 @@ arr = ndarray2array( y[ 1 ] );
 
 The function accepts the following arguments:
 
--   **x**: input ndarray.
+-   **x**: input ndarray. Must have one or more dimensions.
 -   **options**: function options. (_optional_)
 
 The function supports the following `options`:

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

@@ -6,7 +6,7 @@
     Parameters
     ----------
     x: ndarray
-        Input ndarray.
+        Input ndarray. Must have one or more dimensions.
 
     options: Object (optional)
         Options.

lib/node_modules/@stdlib/ndarray/pop/docs/types/index.d.ts

@@ -39,6 +39,10 @@ interface Options {
 /**
 * Returns an array containing a read-only truncated view of an input ndarray and a read-only view of the last element(s) along a specified dimension.
 *
+* ## Notes
+*
+* -   The input array must have one or more dimensions.
+*
 * @param x - input array
 * @param options - function options
 * @param options.dim - dimension along which to perform the operation