docs: fix example and update docs

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Author: kgryte

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

@@ -880,7 +880,7 @@ struct ndarray * stdlib_ndarray_allocate( int16_t dtype, uint8_t *data, int64_t
 Notes:
 
 -   The user is responsible for freeing the allocated memory.
--   To allocate a zero-dimensional ndarray, provide a `shape` argument equal to `NULL`, an `ndims` argument equal to `0`, and a `strides` argument consisting of a single element equal to `0`. The `order` argument can be either row-major or column-major and has no effect on data storage or access.
+-   To allocate a zero-dimensional ndarray, provide a `shape` argument equal to a null pointer, an `ndims` argument equal to `0`, and a `strides` argument consisting of a single element equal to `0`. The `order` argument can be either row-major or column-major and has no effect on data storage or access.
 
 #### stdlib_ndarray_bytelength( \*arr )
 

lib/node_modules/@stdlib/ndarray/ctor/src/main.c

@@ -40,7 +40,7 @@
 * -   To create a zero-dimensional array,
 *
 *     -   provide an `ndims` argument equal to `0`.
-*     -   a `shape` argument equal to `NULL`.
+*     -   a `shape` argument equal to a null pointer.
 *     -   a `strides` argument containing a single element equal to `0`.
 *
 *     The `order` argument can be either row-major or column-major and has no effect on data storage or access.
@@ -53,7 +53,7 @@
 *     #include <stdint.h>
 *
 *     uint8_t buffer[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
-*     int64_t shape[] = NULL;
+*     int64_t *shape = NULL;
 *     int64_t strides = { 0 };
 *     int64_t offset = 0;
 *