Documentation: Fix spelling errors

These issues were found and fixed by codespell, a useful tool for
finding spelling errors.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: If2a8e97911420c19e9365d5c28810b998f2c2ac8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58078
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Documentation/gcov.txt b/Documentation/gcov.txt
index 896ec93..750e883 100644
--- a/Documentation/gcov.txt
+++ b/Documentation/gcov.txt
@@ -19,7 +19,7 @@
 +#define BITS_PER_UNIT 8
 +#define LONG_LONG_TYPE_SIZE 64
 +
-+/* There are many gcc_assertions. Set the vaule to 1 if we want a warning
++/* There are many gcc_assertions. Set the value to 1 if we want a warning
 +   message if the assertion fails.  */
 +#ifndef ENABLE_ASSERT_CHECKING
 +#define ENABLE_ASSERT_CHECKING 1