env: Kconfig: cosmetics: update comment for SYS_RELOC_GD_ENV_ADDR

Update the comment for SYS_RELOC_GD_ENV_ADDR as gd->env_addr is updated
in board_r.c::initr_reloc_global_data() under the compilation flags
CONFIG_SYS_RELOC_GD_ENV_ADDR

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/env/Kconfig b/env/Kconfig
index ca7fef6..38e7fad 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -562,7 +562,7 @@
 	  UBI VID offset for environment. If 0, no custom VID offset is used.
 
 config SYS_RELOC_GD_ENV_ADDR
-	bool "Relocate gd->en_addr"
+	bool "Relocate gd->env_addr"
 	help
 	  Relocate the early env_addr pointer so we know it is not inside
 	  the binary. Some systems need this and for the rest, it doesn't hurt.