Document C API and update description

Author: kgryte

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

@@ -2270,6 +2270,21 @@ Notes:
 -   The function does **not** verify that the output address type matches the underlying input ndarray data type and **assumes** that you know what you are doing.
 -   The function returns `-1` if unable to get an element and `0` otherwise.
 
+* * *
+
+#### stdlib_ndarray_iget_ptr( \*arr, idx )
+
+Returns a pointer in the underlying byte array for an ndarray data element located at a specified linear index.
+
+```c
+uint8_t * stdlib_ndarray_iget_ptr( const struct ndarray *arr, const int64_t idx );
+```
+
+The function accepts the following arguments:
+
+-   **arr**: `[in] struct ndarray*` input ndarray.
+-   **idx**: `[in] int64_t` linear view index.
+
 </section>
 
 <!-- /.usage -->

lib/node_modules/@stdlib/ndarray/ctor/include/stdlib/ndarray/ctor/iget_ptr.h

@@ -23,7 +23,7 @@
 #include <stdint.h>
 
 /**
-* Returns an underlying byte array pointer to an ndarray data element located at a specified linear index.
+* Returns a pointer in the underlying byte array for an ndarray data element located at a specified linear index.
 */
 uint8_t * stdlib_ndarray_iget_ptr( const struct ndarray *arr, const int64_t idx );
 

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

@@ -27,7 +27,7 @@
 #include <stdint.h>
 
 /**
-* Returns an underlying byte array pointer to an ndarray data element located at a specified linear index.
+* Returns a pointer in the underlying byte array for an ndarray data element located at a specified linear index.
 *
 * @param arr  input ndarray
 * @param idx  linear view index