misc doc and kconfig typos

Fix various typos in kernel docs and Kconfigs, 2.6.21-rc4.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
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 c141f23..b49ce16 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -1633,7 +1633,7 @@
      - assignment : function number of the pin according to the Pin Assignment
        tables in User Manual.  Each pin can have up to 4 possible functions in
        QE and two options for CPM.
-     - has_irq : indicates if the pin is used as source of exteral
+     - has_irq : indicates if the pin is used as source of external
        interrupts.
 
    Example: