manual.yml: remove contingent tests

Also clarify non-prescriptive nature of some tests in jq.test

docs/content/manual/manual.yml

@@ -863,8 +863,8 @@ sections:
 
         examples:
           - program: 'map(abs)'
-            input: '[-10, -1.1, -1e-1, 1000000000000000002, -1000000000000000002]'
-            output: ['[10,1.1,1e-1,10000000000000002,1e+18]']
+            input: '[-10, -1.1, -1e-1]'
+            output: ['[10,1.1,1e-1]']
 
       - title: "`length`"
         body: |