Merge pull request #350 from rustprooflabs/doc-cleanup

Minor doc improvements

docs/src/custom-indexes.md

@@ -1,11 +1,13 @@
 # Indexes
 
-PgOSM Flex allows the indexes on the tables using `.ini` files. The default
+PgOSM Flex allows customizing the indexes on the tables using `.ini` files. The default
 index configuration files are stored under `flex-config/indexes/`.
 The default indexing strategy is baked into the Docker
 image, to use the defaults you can follow the instructions throughout the
 documentation without any adjustments.
 
+> Custom indexes added in PgOSM Flex 0.10.0.
+
 ## Map Volume in `docker run`
 
 To customize indexes, map the path of your custom index definitions folder
@@ -34,6 +36,7 @@ docker run --name pgosm -d --rm \
 
 Each Lua style (`flex-config/style/*.lua`) must have a matching INI file
 under `flex-config/indexes/`.  Each `.ini` file should have 4 sections defined.
+These sections can all be empty.
 
 
 ```ini
@@ -61,6 +64,8 @@ PgOSM Flex database. `<name>` is the name of the column in the database.
 * `<name>_where`
 * `<name>_method`
 
+> See the section [Most Columns can be Indexed](custom-indexes.md#most-columns-can-be-indexed) for details about which columns can be indexed.
+
 ### To index or not to index
 
 The `<name>` variable is the column's name and is set to boolean.