Update rules/Proj0810.md

Co-authored-by: Wesley Baartman <[email protected]>

Author: Corniel

rules/Proj0810.md

@@ -6,6 +6,6 @@ ancestor: Rules
 # Proj0810: Remove unused package versions
 When using [Central Package Management](Proj0800.md) the central
 `Directory.Packages.props` contains `<PackageVersion>`s for all
-`<PackageRefence>`'s in the solution. To reduce noise, thie rule reports on
+`<PackageRefence>`s in the solution. To reduce noise, this rule reports on
 `<PackageVersion`'s that are (not longer) referenced. This rule requires a
 [`.net.csproj` SDK project](../general/sdk.md) to work.