Fix typos in Documentation/: 'Q'-'R'

This patch fixes typos in various Documentation txts. The patch addresses
some words starting with the letters 'Q'-'R'.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index ee27203..8ca9a56 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -245,7 +245,7 @@
 ---------
 
    The kernel is entered with r3 pointing to an area of memory that is
-   roughtly described in include/asm-powerpc/prom.h by the structure
+   roughly described in include/asm-powerpc/prom.h by the structure
    boot_param_header:
 
 struct boot_param_header {
@@ -1068,13 +1068,13 @@
     around. It contains no internal offsets or pointers for this
     purpose.
 
-  - An example of code for iterating nodes & retreiving properties
+  - An example of code for iterating nodes & retrieving properties
     directly from the flattened tree format can be found in the kernel
     file arch/ppc64/kernel/prom.c, look at scan_flat_dt() function,
-    it's usage in early_init_devtree(), and the corresponding various
+    its usage in early_init_devtree(), and the corresponding various
     early_init_dt_scan_*() callbacks. That code can be re-used in a
     GPL bootloader, and as the author of that code, I would be happy
-    do discuss possible free licencing to any vendor who wishes to
+    to discuss possible free licencing to any vendor who wishes to
     integrate all or part of this code into a non-GPL bootloader.