pw-dot: update page (#12883)

pages/linux/pw-dot.md

@@ -8,22 +8,30 @@
 
 `pw-dot`
 
-- Specify an output file, showing all object types:
+- Read objects from `pw-dump` JSON file:
 
-`pw-dot --output {{path/to/file.dot}} --all`
+`pw-dot {{-j|--json}} {{path/to/file.json}}`
+
+- Specify an [o]utput file, showing [a]ll object types:
+
+`pw-dot --output {{path/to/file.dot}} {{-a|--all}}`
 
 - Print `.dot` graph to `stdout`, showing all object properties:
 
-`pw-dot --output - --detail`
+`pw-dot --output - {{-d|--detail}}`
 
-- Generate a graph from a remote instance, showing only linked objects:
+- Generate a graph from a [r]emote instance, showing only linked objects:
 
-`pw-dot --remote {{remote_name}} --smart`
+`pw-dot --remote {{remote_name}} {{-s|--smart}}`
 
-- Lay the graph from left to right, instead of dot's default top to bottom:
+- Lay the graph from [l]eft to [r]ight, instead of dot's default top to bottom:
 
-`pw-dot --lr`
+`pw-dot {{-L|--lr}}`
 
 - Lay the graph using 90-degree angles in edges:
 
-`pw-dot --90`
+`pw-dot {{-9|--90}}`
+
+- Display help:
+
+`pw-dot --help`