Update and rename max_element_pos.md to max_element_index.md

snippets/max_element_index.md

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+---
+title: max_element_index
+tags: list,beginner
+---
+
+Returns the pindex of the element with the maximum value in a list.
+
+Use `max()` and `list.index()` to get the maximum value in the list and return its index.
+
+```py
+def max_element_index(arr):
+  return arr.index(max(arr))
+```
+
+```python
+max_element_index([5, 8, 9, 7, 10, 3, 0]) # 4
+```