Update update_v1.6->v1.7.md

Author: aslgraefe

v1.7/update_v1.6->v1.7.md

@@ -6,7 +6,9 @@
 
 #### added variables: 
 - ln_48007_9_1, ln_48007_9_2, ln_48007_9_3: zygosity of a variant (clinically relevant variants)
+  - same value set as 'ln_48007_9' in v1.6
 - ln_48007_9_4, ln_48007_9_5, ln_48007_9_6, ln_48007_9_7, ln_48007_9_8: zygosity of additional geneitc variants
+  - same value set as 'ln_48007_9' in v1.6
 
 
 #### choices encoding changed: