Update Norwegian stemmer algorithm description

Algorithm is the same, just incorporating recent extended explainations of how it works.

Author: Blake-Madden

docs/manual/norwegian.qmd

@@ -30,13 +30,17 @@ Step 1:
 
     (_b_) **_ers_**
 
-      find the longest suffix preceding **_ers_**, and perform the action indicated.
+      check the suffix preceding **_ers_** and perform the action indicated for the first match found:
 
-        (_i_\> **_amm   ast   ind   kap   kk   lt   nk   omm   pp   v   øst_**
+        (_i_) **_giv   hav   skap_**
+
+          delete **_ers_** suffix
+
+        (_ii_) **_amm   ast   ind   kap   kk   lt   nk   omm   pp   v   øst_**
 
           do nothing
 
-        (_ii_\> **_giv   hav   skap_**
+        (_iii_) if none of these suffixes are present
 
           delete **_ers_** suffix