Fix environment variables in mapcache_timedb README

mapcache_timedb/README.md

@@ -27,13 +27,13 @@ for more details.
   products and the `true_color` RGB product.
 * `SATELLITES`: Satellite platforms to include in processing. Defaults to
   "g16 g17".
-* `INSTRUMENTS`: Instruments to process. Defaults to "abi".
-* `SECTORS`: Sectors to process. Defaults to "radf radc radm1 radm2".
-* `SEED`: Whether or not to pre-seed the cache when layers are added. Can be
+* `MAPCACHE_INSTRUMENTS`: Instruments to process. Defaults to "abi".
+* `MAPCACHE_SECTORS`: Sectors to process. Defaults to "radf radc radm1 radm2".
+* `MAPCACHE_SEED`: Whether or not to pre-seed the cache when layers are added. Can be
   "0" for off (the default) or anything else for True.
-* `SEED_OVERLAYS`: Whether or not to pre-seed the basemap, borders, and
+* `MAPCACHE_SEED_OVERLAYS`: Whether or not to pre-seed the basemap, borders, and
   graticules layers when this container starts. For an empty cache this can
   take a couple minutes per layer. Defaults to True, can be turned off by
   specifying as "0". This does not obey the `SEED_ARGS` environment variable
   (see below).
-* `SEED_ARGS`: Extra arguments to pass to `mapcache_seed`. Defaults to "".
+* `MAPCACHE_SEED_ARGS`: Extra arguments to pass to `mapcache_seed`. Defaults to "".