[DOCS] Tidied up the multi-indices docs

docs/reference/api-conventions.asciidoc

@@ -26,17 +26,30 @@ support wildcards, for example: `test*`, and the ability to "add" (`+`)
 and "remove" (`-`), for example: `+test*,-test3`.
 
 All multi indices API support the following url query string parameters:
-* `ignore_unavailable` - Controls whether to ignore if any specified indices are unavailable, this includes indices
-   that don't exist or closed indices. Either `true` or `false` can be specified.
-* `allow_no_indices` - Controls whether to fail if a wildcard indices expressions results into no concrete indices.
-   Either `true` or `false` can be specified. For example if the wildcard expression `foo*` is specified and no indices
-   are available that start with `foo` then depending on this setting the request will fail. This setting is also applicable
-   when `_all`, `*` or no index has been specified.
-* `expand_wildcards` - Controls to what kind of concrete indices wildcard indices expression expand to. If `open` is
-  specified then the wildcard expression if expanded to only open indices and if `closed` is specified then the wildcard
-  expression if expanded only to closed indices. Also both values (`open,closed`) can be specified to expand to all indices.
-
-The defaults settings for the above parameters dependent on the api being used.
+
+`ignore_unavailable`::
+
+Controls whether to ignore if any specified indices are unavailable, this
+includes indices that don't exist or closed indices. Either `true` or `false`
+can be specified.
+
+`allow_no_indices`::
+
+Controls whether to fail if a wildcard indices expressions results into no
+concrete indices. Either `true` or `false` can be specified. For example if
+the wildcard expression `foo*` is specified and no indices are available that
+start with `foo` then depending on this setting the request will fail. This
+setting is also applicable when `_all`, `*` or no index has been specified.
+
+`expand_wildcards`::
+
+Controls to what kind of concrete indices wildcard indices expression expand
+to. If `open` is specified then the wildcard expression if expanded to only
+open indices and if `closed` is specified then the wildcard expression if
+expanded only to closed indices. Also both values (`open,closed`) can be
+specified to expand to all indices.
+
+The defaults settings for the above parameters depend on the api being used.
 
 NOTE: Single index APIs such as the <<docs>> and the
 <<indices-aliases,single-index `alias` APIs>> do not support multiple indices.