docs: apply suggestions from code review

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Author: headlessNode

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

@@ -75,7 +75,7 @@ arr = ndarray2array( y[ 1 ] );
 The function accepts the following arguments:
 
 -   **x**: input ndarray.
--   **dim**: dimension along which to perform the operation.
+-   **dim**: dimension along which to perform the operation. If provided an integer less than zero, the dimension index is resolved relative to the last dimension, with the last dimension corresponding to the value `-1`.
 -   **strict**: boolean indicating whether to enforce strict bounds checking.
 -   **writable**: boolean indicating whether a returned ndarray should be writable.