Minor html fixes

I've run tidy over each html page and corrected found errors which included a number of missing tags and also duplicate IDs/Anchors

Changes not made but which could also be done

docs\AHKL_ChangeLog.htm:

line 402 column 41 - Warning: unescaped & which should be written as &amp;
line 430 column 117 - Warning: unescaped & which should be written as &amp;
line 441 column 52 - Warning: unescaped & which should be written as &amp;
line 441 column 95 - Warning: unescaped & which should be written as &amp;
line 687 column 121 - Warning: replacing invalid numeric character reference 133
line 701 column 58 - Warning: unescaped & which should be written as &amp;
line 747 column 169 - Warning: unescaped & which should be written as &amp;

docs\license.htm:

line 37 column 1 - Warning: trimming empty dt
line 39 column 1 - Warning: trimming empty dt
line 41 column 1 - Warning: trimming empty dt
line 53 column 1 - Warning: trimming empty dt
line 55 column 1 - Warning: trimming empty dt
line 57 column 1 - Warning: trimming empty dt