Include ALTO in list of supported output formats

Author: jakesebright

README.md

@@ -24,7 +24,7 @@ and GitHub's log of [contributors](https://github.com/tesseract-ocr/tesseract/gr
 
 Tesseract has **unicode (UTF-8) support**, and can **recognize more than 100 languages** "out of the box".
 
-Tesseract supports **various output formats**: plain-text, hocr(html), pdf, tsv, invisible-text-only pdf.
+Tesseract supports **various output formats**: plain text, hOCR (HTML), PDF, invisible-text-only PDF, TSV. The master branch also has experimental support for ALTO (XML) output.
 
 You should note that in many cases, in order to get better OCR results, you'll need to **[improve the quality](https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality) of the image** you are giving Tesseract.
 

doc/tesseract.1.asc

@@ -90,6 +90,7 @@ OPTIONS
 	contains a list of variables and their values, one per line, with a
 	space separating variable from value.  Interesting config files
 	include: +
+  * `alto` - Output in ALTO format (file extension `.xml`).
   * `hocr` - Output in hOCR format (file extension `.hocr`).
   * `pdf` - Output PDF (file extension `.pdf`).
   * `tsv` - Output TSV (file extension `.tsv`).