Update diff-tool.order.source.md

Author: SimonCropp

docs/mdsource/diff-tool.order.source.md

@@ -11,7 +11,7 @@ include: defaultOrder
 
 ### ViaEnvironment Variable
 
-Set an `DiffEngine_ToolOrder` environment variable with the preferred order of toll resolution. The value can be comma (`,`), pipe (`|`), or space separated.
+Set an `DiffEngine_ToolOrder` environment variable with the preferred order of tool resolution. The value can be comma (`,`), pipe (`|`), or space separated.
 
 For example `VisualStudio,Meld` will result in VisualStudio then Meld then all other tools being the order.