Edits to Scribal Documents and Correspondence index pages

On the scribal documents index
(http://whitmanarchive.org/manuscripts/scribal/index.html), I updated
the TEI encoding of three dates, which had erroneously been given in
an attribute value as dating to 1872. The scribal document records
updated in the index file were:

Amos T. Akerman to Henry Grebe, 2 August 1871
Amos T. Akerman to William P. Appleby, 2 or 3 August 1871
Amos T. Akerman to John H. Caldwell, 3 August 1871


In addition, I made two corrections to the correspondence index
(http://www.whitmanarchive.org/biography/correspondence/index.html).
The index listed Walt Whitman to Louisa Van Velsor Whitman, [5 January
1872] as dating only to Walt Whitman to Louisa Van Velsor Whitman,
[January 1872] and Peter Doyle to Walt Whitman, [27 September 1868] as
only Peter Doyle to Walt Whitman, [September 1868]. The dates are now
correct on the index page (they already were correct in the individual
letter files).

~Liz