Fix name of file in tutorial

jwakely · stefanseefeld · commit 72e254bf8b9a · 2019-03-23T20:38:29.000-04:00
I think it's meant to refer to the Jamroot file being discussed, not Jamrules.
diff --git a/doc/tutorial.qbk b/doc/tutorial.qbk
@@ -121,7 +121,7 @@ __jam__
 file. Simply copy the file and tweak [^use-project boost] to where your
 boost root directory is and you're OK.
 
-The comments contained in the Jamrules file above should be sufficient
+The comments contained in the Jamroot file above should be sufficient
 to get you going.
 
 [h2 Running bjam]
