conf/documentation.conf: remove OE_IMPORTS

oe-core no longer supports OE_IMPORTS[1], so remove the documentation.

[1] oe-core 1f56155e ("base: Switch to use addpylib directive and
    BB_GLOBAL_PYMODULES")

(From OE-Core rev: d1388e0958c8013179a948e08bf989c07f8654ca)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/documentation.conf

@@ -299,7 +299,6 @@ NO_RECOMMENDATIONS[doc] = "When set to '1', no recommended packages will be inst
 #O
 
 OE_BINCONFIG_EXTRA_MANGLE[doc] = "When a recipe inherits the binconfig.bbclass class, this variable specifies additional arguments passed to the "sed" command."
-OE_IMPORTS[doc] = "An internal variable used to tell the OpenEmbedded build system what Python modules to import for every Python function run by the system."
 OE_TERMINAL[doc] = "Controls how the OpenEmbedded build system spawns interactive terminals on the host development system."
 OEROOT[doc] = "The directory from which the top-level build environment setup script is sourced."
 OLDEST_KERNEL[doc] = "Declares the oldest version of the Linux kernel that the produced binaries must support."