u-boot: Fix several typos

's/environemnt/environment/' and
	's/Environemnt/Environment/'

Signed-off-by: Shyam Saini <shyam@amarulasolutions.com>
diff --git a/env/Kconfig b/env/Kconfig
index f403906..ec66c13 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -15,7 +15,7 @@
 	default y
 	help
 	  Define this if you don't want to or can't have an environment stored
-	  on a storage medium. In this case the environemnt will still exist
+	  on a storage medium. In this case the environment will still exist
 	  while U-Boot is running, but once U-Boot exits it will not be
 	  stored. U-Boot will therefore always start up with a default
 	  environment.
@@ -391,7 +391,7 @@
 	                   partition table then means device D.
 
 config ENV_FAT_FILE
-	string "Name of the FAT file to use for the environemnt"
+	string "Name of the FAT file to use for the environment"
 	depends on ENV_IS_IN_FAT
 	default "uboot.env"
 	help
@@ -423,7 +423,7 @@
 	                   partition table then means device D.
 
 config ENV_EXT4_FILE
-	string "Name of the EXT4 file to use for the environemnt"
+	string "Name of the EXT4 file to use for the environment"
 	depends on ENV_IS_IN_EXT4
 	default "uboot.env"
 	help