docs(ADataTable): clarify onScrollToEnd prop invocation

[brennarvo]

Please check if the PR fulfills these requirements

• [ ] The commit message follows semantic commit message guidelines
• [ ] The changes are documented in component docs and changelog
• [ ] The ESLint plugin has been updated if a new component is added
• [ ] Test have been added or modified, if appropriate
• [ ] Has been verified locally

What kind of change does this PR introduce?

Documents the behavior of the onScrollToEnd prop inside ADataTable.

What is the current behavior?

The docs do not mention that onScrollToEnd is called only for the initial scroll to the bottom of the table.

What is the new behavior (if this is a feature change)?

Clarifies that onScrollToEnd only fires when the user first reaches the bottom of the table.

Does this PR introduce a breaking change?

No

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[codecov[bot]]

Codecov Report

Merging #1194 (f098594) into master (d3ecaba) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1194   +/-   ##
=======================================
  Coverage   90.47%   90.47%           
=======================================
  Files          98       98           
  Lines        3056     3056           
  Branches     1045     1045           
=======================================
  Hits         2765     2765           
  Misses        250      250           
  Partials       41       41           

Impacted Files	Coverage Δ
framework/components/ADataTable/ADataTable.js	100.00% <ø> (ø)

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