awful.placement: Add `maximize` aliases

Use the same conventions as `align` and `stretch` aliases

lib/awful/placement.lua

@@ -677,6 +677,19 @@ function placement.maximize(d, args)
     attach(d, placement.maximize, args)
 end
 
+-- Add the alias functions
+for _, v in ipairs {"vertically", "horizontally"} do
+    placement["maximize_"..v] = function(d2, args)
+        args = args or {}
+        local new_args = setmetatable({axis = v}, {__index=args})
+        placement.maximize(d2, new_args)
+    end
+end
+
+---@DOC_awful_placement_maximize_vertically_EXAMPLE@
+
+---@DOC_awful_placement_maximize_horizontally_EXAMPLE@
+
 return placement
 
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