firmware: some documentation fixes

Including:
 - Fixup outdated kernel-doc paths
 - Slightly too short title underline
 - Some typos

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/base/firmware_loader/fallback.h b/drivers/base/firmware_loader/fallback.h
index dfebc64..f825567 100644
--- a/drivers/base/firmware_loader/fallback.h
+++ b/drivers/base/firmware_loader/fallback.h
@@ -6,7 +6,7 @@
 #include <linux/device.h>
 
 /**
- * struct firmware_fallback_config - firmware fallback configuratioon settings
+ * struct firmware_fallback_config - firmware fallback configuration settings
  *
  * Helps describe and fine tune the fallback mechanism.
  *