add passive tree search tip (#1388)

Author: Nightblade

src/Classes/TreeTab.lua

@@ -157,7 +157,7 @@ local TreeTabClass = newClass("TreeTab", "ControlHost", function(self, build)
 		self.viewer.searchStr = buf
 		self.searchFlag = buf ~= self.viewer.searchStrSaved
 	end, nil, nil, true)
-	self.controls.treeSearch.tooltipText = "Uses Lua pattern matching for complex searches\nPrefix your search with \"oil:\" to search by anoint recipe"
+	self.controls.treeSearch.tooltipText = "Uses Lua pattern matching for complex searches.\nPrefix your search with \"oil:\" to search by anoint recipe.\nTo search for multiple terms: (increased.fire.damage|increased.area.of.effect|etc)"
 
 	self.tradeLeaguesList = { }
 	-- Find Timeless Jewel Button