Use Windows-style parameters to be consistent with other command examples

Author: petli

README.md

@@ -391,7 +391,7 @@ These steps must be followed before you attempt to open the solution in an IDE (
 
 There is a performance test for the hit counting instrumentation in the test project `coverlet.core.performancetest`.  Build the project with the msbuild step above and then run:
 
-    dotnet test -p:CollectCoverage=true test/coverlet.core.performancetest/
+    dotnet test /p:CollectCoverage=true test/coverlet.core.performancetest/
 
 The duration of the test can be tweaked by changing the number of iterations in the `[InlineData]` in the `PerformanceTest` class.
 

test/coverlet.core.performancetest/PerformanceTest.cs

@@ -9,7 +9,7 @@ namespace coverlet.core.performancetest
     /// Test the performance of coverlet by running a unit test that calls a reasonably big and complex test class.
     /// Enable the test, compile, then run the test in the command line:
     /// <code>
-    /// dotnet test -p:CollectCoverage=true test/coverlet.core.performancetest/
+    /// dotnet test /p:CollectCoverage=true test/coverlet.core.performancetest/
     /// </code>
     /// </summary>
     public class PerformanceTest