fix(docs): organize cluster mode part of lua scripting (#3073)

Author: mattwang44

docs/lua_scripting.rst

@@ -92,19 +92,24 @@ Cluster Mode
 
 Cluster mode has limited support for lua scripting.
 
-The following commands are supported, with caveats: - ``EVAL`` and
-``EVALSHA``: The command is sent to the relevant node, depending on the
-keys (i.e., in ``EVAL "<script>" num_keys key_1 ... key_n ...``). The
-keys *must* all be on the same node. If the script requires 0 keys, *the
-command is sent to a random (primary) node*. - ``SCRIPT EXISTS``: The
-command is sent to all primaries. The result is a list of booleans
-corresponding to the input SHA hashes. Each boolean is an AND of “does
-the script exist on each node?”. In other words, each boolean is True
-iff the script exists on all nodes. - ``SCRIPT FLUSH``: The command is
-sent to all primaries. The result is a bool AND over all nodes’
-responses. - ``SCRIPT LOAD``: The command is sent to all primaries. The
-result is the SHA1 digest.
-
-The following commands are not supported: - ``EVAL_RO`` - ``EVALSHA_RO``
+The following commands are supported, with caveats:
+
+- ``EVAL`` and ``EVALSHA``: The command is sent to the relevant node,
+  depending on the keys (i.e., in ``EVAL "<script>" num_keys key_1 ...
+  key_n ...``). The keys *must* all be on the same node. If the script
+  requires 0 keys, *the command is sent to a random (primary) node*.
+- ``SCRIPT EXISTS``: The command is sent to all primaries. The result
+  is a list of booleans corresponding to the input SHA hashes. Each
+  boolean is an AND of “does the script exist on each node?”. In other
+  words, each boolean is True iff the script exists on all nodes.
+- ``SCRIPT FLUSH``: The command is sent to all primaries. The result
+  is a bool AND over all nodes’ responses.
+- ``SCRIPT LOAD``: The command is sent to all primaries. The result
+  is the SHA1 digest.
+
+The following commands are not supported:
+
+- ``EVAL_RO``
+- ``EVALSHA_RO``
 
 Using scripting within pipelines in cluster mode is **not supported**.