firmware: some documentation fixes

Including:
 - Fixup outdated kernel-doc paths
 - Slightly too short title underline
 - Some typos
Signed-off-by: NAndres Rodriguez <andresx7@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/driver-api/firmware/request_firmware.rst

@@ -50,11 +50,11 @@ Special optimizations on reboot
 Some devices have an optimization in place to enable the firmware to be
 retained during system reboot. When such optimizations are used the driver
 author must ensure the firmware is still available on resume from suspend,
-this can be done with firmware_request_cache() insted of requesting for the
-firmare to be loaded.
+this can be done with firmware_request_cache() instead of requesting for the
+firmware to be loaded.
 
 firmware_request_cache()
------------------------
+------------------------
 .. kernel-doc:: drivers/base/firmware_loader/main.c
    :functions: firmware_request_cache
 

drivers/base/firmware_loader/fallback.c

@@ -537,8 +537,8 @@ fw_create_instance(struct firmware *firmware, const char *fw_name,
 }
 
 /**
- * fw_load_sysfs_fallback - load a firmware via the syfs fallback mechanism
- * @fw_sysfs: firmware syfs information for the firmware to load
+ * fw_load_sysfs_fallback - load a firmware via the sysfs fallback mechanism
+ * @fw_sysfs: firmware sysfs information for the firmware to load
  * @opt_flags: flags of options, FW_OPT_*
  * @timeout: timeout to wait for the load
  *

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.
  *