simplify hg commands for working with patches

ContributionReviews.wiki

diff --git a/ContributionReviews.wiki b/ContributionReviews.wiki
index 858462d..900819b 100644
--- a/ContributionReviews.wiki
+++ b/ContributionReviews.wiki
@@ -89,7 +89,7 @@
 or changes between two revisions
 
 {{{
-hg diff -r REV1 -r REV2 > my_change.diff
+hg diff -r REV1:REV2 > my_change.diff
 }}}
 
 In this example, `new_model.py` would be a newly-added module, and
@@ -98,7 +98,7 @@
 
 {{{
 cd ~/code/melange
-patch -p0 < my_change.diff
+hg import my_change.diff
 }}}
 
 The same root approach should be used with