Fix doxygen examples

Author: greenrobot

include/objectbox.h

@@ -1351,7 +1351,9 @@ OBX_C_API obx_qb_cond obx_qb_any(OBX_query_builder* builder, const obx_qb_cond c
 /// Create an alias for the previous condition (the one added just before calling this function).
 /// This is useful when you have a query with multiple conditions of the same property (e.g. height < 20 or height > 50)
 /// and you want to use obx_query_param_* to change the values. Consider the following simplified example.
-/// @example Create a query with two aliased params and set their values later during query execution:
+///
+/// **Example:** Create a query with two aliased params and set their values later during query execution:
+///
 ///          OBX_query_builder* qb = obx_query_builder(store, entity_id);
 ///          obx_qb_less_than_int(qb, height_prop_id, 0)
 ///          obx_qb_param_alias(qb, "height-lt")

include/objectbox.hpp

@@ -1269,7 +1269,9 @@ class QueryBuilder {
         : QueryBuilder(store, obx_query_builder(store.cPtr(), EntityBinding::entityId()), true) {}
 
     /// Take ownership of an OBX_query_builder.
-    /// @example
+    ///
+    /// *Example:**
+    ///
     ///          QueryBuilder innerQb(obx_qb_link_property(outerQb.cPtr(), linkPropertyId), false)
     explicit QueryBuilder(Store& store, OBX_query_builder* ptr, bool isRoot)
         : store_(store), cQueryBuilder_(ptr), isRoot_(isRoot) {
@@ -1831,7 +1833,9 @@ class Box {
     /// @param toOneRel the relation property, which must belong to the entity type represented by this box.
     /// @param objectId this relation points to - typically ID of an object of another entity type (another box).
     /// @returns resulting IDs representing objects in this Box, or NULL in case of an error
-    /// @example Let's say you have the following two entities with a relation between them (.fbs file format):
+    ///
+    /// **Example** Let's say you have the following two entities with a relation between them (.fbs file format):
+    ///
     ///          table Customer {
     ///              id:ulong;
     ///              name:string;