Fix various typos.

docs/BUGS

@@ -65,7 +65,7 @@ If your image does not boot, please report it to the mailing list together with
 the information requested in 2. Do not forget to mention, how/when the image
 failed, in qemu, vmware or real hardware. If you are using a virtualization
 technology of any kind, do always run it on real hardware before reporting a
-bug. Nevertheless, providing a screenshot of the failure is also very helpfull.
+bug. Nevertheless, providing a screenshot of the failure is also very helpful.
 
 
 ...at run time?

docs/CREDITS

@@ -23,7 +23,7 @@ Patches (alphabetical order):
   * Trent Buck <trentbuck@gmail.com>
   * Vladimir Stavrinov <vs@inist.ru>
 
-Donations (alphaetical order):
+Donations (alphabetical order):
 
   * Gracie <gracie@bithawk.net>
 

docs/DOWNLOAD

@@ -5,7 +5,7 @@ Although Debian Live is about creating your own customized Live system, we offer
 some prebuilt images as well. Currently, builds for the three desktop
 environments GNOME[0], KDE[1] and Xfce[2] as well as the standard system are
 available. Builds based on testing are created every week and the ones based on
-unstable are build daily. For stable, we build update them when needed.
+unstable are built daily. For stable, we update them when needed.
 
 Currently, the following flavours are autobuilt here (.iso for CD/DVD images,
 .img for USB stick images):

docs/FAQ

@@ -10,7 +10,7 @@ A: live-helper supports Debian and Ubuntu right now. Adding automatic defaults
    include it.
 
 
-Q: How can I build images with an unprevileged user account?
+Q: How can I build images with an unprivileged user account?
 A: You can use --root-command sudo or set LH_ROOT_COMMAND="sudo" in
    config/common.