Update references to the SANE Standard documentation

Also fixes up minor typos in include/sane/sanei.h.

README

@@ -24,9 +24,8 @@ For details about installation please read the INSTALL file.
 For a list of other SANE frontends look at
 http://www.sane-project.org/sane-frontends.html.
 
-Developers may wish to look at the SANE standard (sane.tex). It can be found
-in the sane-backends distribution or in various file formats at the website:
-http://www.sane-project.org/docs.html
+Developers may wish to look at the SANE standard. It can be found at:
+https://sane-project.gitlab.io/standard/
 
 Please report bugs and missing features at our bug-tracking system:
 http://www.sane-project.org/bugs.html

include/sane/sanei.h

@@ -59,18 +59,17 @@
  * Please use the SANEI functions wherever possible.
  *
  * This documentation was created by the use of doxygen, the 
- * doc/doxygen-sanei.conf configuration file and dcoumentation in the sanei_*.h
+ * doc/doxygen-sanei.conf configuration file and documentation in the sanei_*.h
  * files.
  *
- * This documenation is far from complete. Any help is appreciated.
+ * This documentation is far from complete. Any help is appreciated.
  *
  * @section additional Additional documentation
- * - The SANE standard can be found at <a 
- *   href="http://www.sane-project.org/html/">the SANE webserver</a>.
+ * - The <a href="https://sane-project.gitlab.io/standard/">SANE Standard</a>.
  * - Information on how to write a backend: <a
  *   href="../backend-writing.txt">backend-writing.txt</a>.
  * - General SANE documentation is on <a
- *   href="http://www.sane-project.org/docs.html>the SANE documentation
+ *   href="http://www.sane-project.org/docs.html">the SANE documentation
  *   page</a>.
  * 
  * @section contact Contact