documentation: clk: fix couple of misspelling

Correcting misspelling inside the clk.txt.

Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/Documentation/clk.txt b/Documentation/clk.txt
index 1943fae0..4274a54 100644
--- a/Documentation/clk.txt
+++ b/Documentation/clk.txt
@@ -174,9 +174,9 @@
 };
 
 Below is a matrix detailing which clk_ops are mandatory based upon the
-hardware capbilities of that clock.  A cell marked as "y" means
+hardware capabilities of that clock.  A cell marked as "y" means
 mandatory, a cell marked as "n" implies that either including that
-callback is invalid or otherwise uneccesary.  Empty cells are either
+callback is invalid or otherwise unnecessary.  Empty cells are either
 optional or must be evaluated on a case-by-case basis.
 
                            clock hardware characteristics