.git/.gitignore: Added files for the new kernel document.

added the HTML and TAR files to this ignore file.

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>

.gitignore

@@ -29,4 +29,6 @@ documentation/bsp-guide/bsp-guide.pdf
 documentation/bsp-guide/bsp-guide.tgz
 documentation/yocto-project-qs/yocto-project-qs.html
 documentation/yocto-project-qs/yocto-project-qs.tgz
+documentation/kernel-manual/yocto-project-kernel-manual.html
+documentation/kernel-manual/yocto-project-kernel-manual.tgz