[Doc]: documentation alignment with schema files

[vovamarch]

Following can be improved in the documenation of cmsis-toolbox .yml files, to make them better aligned with the json schema files:

1. Organize the description of sub-nodes alphabetically. IntelliSense lists them in this way, and it is easier to maintain (e.g. nodes target-types, solution, build-types).

2. Schema file contains extra elements for the following nodes. It needs to be decided whether documentation shall reflect that, or schema file to be updated
   a) solution:
   "processor": { "$ref": "#/definitions/ProcessorType" },
   "optimize": { "$ref": "#/definitions/OptimizeType" },
   "debug": { "$ref": "#/definitions/DebugType" },
   "warnings": { "$ref": "#/definitions/WarningsType" },
   "define": { "$ref": "#/definitions/DefinesType" },
   "define-asm": { "$ref": "#/definitions/DefinesType" },
   "undefine": { "$ref": "#/definitions/UndefinesType" },
   "add-path": { "$ref": "#/definitions/AddpathsType" },
   "add-path-asm": { "$ref": "#/definitions/AddpathsType" },
   "del-path": { "$ref": "#/definitions/DelpathsType" },
   "misc": { "$ref": "#/definitions/MiscTypes" },
   "variables": { "$ref": "#/definitions/VariablesType" }
   b) output-dirs:
   "cprjdir": { "type": "string" }
   c**) build-types**
   "processor": { "$ref": "#/definitions/ProcessorType" },
   c) misc:
   "MiscType": {
   "Lib": { "$ref": "#/definitions/ArrayOfStrings", "description": "List of Library Manager or Archiver flags" }

3. generator in schema (GeneratorType) lists the following items as mandatory, but documentation has them as optional:
   "required": [ "generator", "path", "gpdsc", "command" ]

4. Documentation has single description for the nodes, while schema has several different types. For example PacksType and BuildPacksType , ExecuteTypes and BuildExecutesType. If there's no difference in documentation, shouldn't there be also no difference in schema, and so just one node schema could be used?