14-schemas: Using oneOf rather than anyOf for titled enumerations

- This is the recommendation from json-schema-org/json-schema-spec#57 (comment)

collections/clause_14_schemas.adoc

@@ -240,12 +240,12 @@ The next example is the schema of a land cover collection.
       "title" : "Land Cover",
       "type" : "integer",
       "x-ogc-propertySeq" : 1,
-      "anyOf": [
+      "oneOf": [
          { "const": 0 },
          { "const": 1, "title": "vegetation" },
          { "const": 2, "title": "bare soils" },
          { "const": 3, "title": "water" },
-         { "const": 4, "title": "clouds" },
+         { "const": 4, "title": "clouds" }
       ],
       "x-ogc-nilValues": [
          { "const": 0, "title": "no data" }

collections/recommendations/schemas/REC_properties.adoc

@@ -10,7 +10,7 @@
 ^|F |For string properties, "minLength", "maxLength", "enum" and/or "pattern" SHOULD be provided, where applicable.
 ^|G |For numeric properties, "multipleOf", "minimum", "exclusiveMinimum", "maximum", "exclusiveMaximum" SHOULD be provided, where applicable.
 ^|H |For integer properties that represent enumerated values without providing a description for each, "enum" SHOULD be provided.
-^|I |For integer properties that represent enumerated values while providing a description for each, "anyOf" with a combination of "const" and "title" for each entry SHOULD be provided.
+^|I |For integer properties that represent enumerated values while providing a description for each, "oneOf" with a combination of "const" and "title" for each entry SHOULD be provided.
 ^|J |For array properties, the property SHOULD consist of items that are strings or numbers.
 ^|K |Required properties SHOULD be included in "required".
 ^|L |The JSON Schema keywords SHOULD be constrained to those mentioned in this recommendation, requirement `/req/{req-class}/properties` and requirements in the _additional keywords_ section below.