Docs: On maxEOF with eol-last (fixes #12742)

docs/rules/no-multiple-empty-lines.md

@@ -94,3 +94,7 @@ var bar = 3;
 ## When Not To Use It
 
 If you do not care about extra blank lines, turn this off.
+
+## Using It With The `eol-last` Rule
+
+If you wish to use this rule with the `eol-last` core rule regarding ending files with a single newline character, `maxEOF` should be set to 0, as an empty line is actually represented by two newline characters (`\n\n`). There is no empty line at the end of a file after the last `\n`, although editors may show an additional line.