Constraints tweaks

Author: spanezz

doc/devel/constraints.md

@@ -55,6 +55,8 @@ After this step, all features have been loaded and initialized.
 
 Site content directories are scanned.
 
+After this step, all source material has been mapped out.
+
 ### 4: Contents
 
 Pages are created from site sources.
@@ -71,6 +73,6 @@ Create autogenerated pages.
 
 After this step, no more pages can be added.
 
-### 7: Crossreferemce
+### 7: Crossreference
 
 Final processing of page crossreferences.