fix: fix null link markup and remove duplicate anchor in databases

guides/protocols/odata.md

@@ -799,7 +799,7 @@ service S {
 
 In addition, the following functions are supported:
 
-* `$Null()` representing the `null` value [`Null`]([annotation expression](#null-value)).
+* `$Null()` representing the `null` value ([annotation expression](#null-value)).
 * `Div(...)` (or `$Div(...)`) and `Mod(...)` (or `$Mod(...)`) for integer division and modulo
 * [`Has(...)`](https://docs.oasis-open.org/odata/odata/v4.02/csd01/part2-url-conventions/odata-v4.02-csd01-part2-url-conventions.html#Has) (or `$Has(...)`)
 * the functions listed in sections

node.js/databases.md

@@ -24,7 +24,7 @@ In case of database services this actually starts the transaction by acquiring a
 This method is called automatically by the framework on the first query, so **you never have to call it** in application coding. There are only very rare cases where you'd want to do so, for example to reuse a `tx` object to start subsequent physical transactions after a former `commit` or `rollback`. But this is not considered good practice.
 
 
-## cds.DatabaseService — Consumption {#databaseservice-consumption }
+## cds.DatabaseService — Consumption 
 ###### databaseservice-consumption