Clause 7 - Styles API: Attempt to clarify NamedLayer vs. FeatureTypeN…

[jerstlouis]

…ame/CoverageName requirements and recommendations

• At the previous commit, there was a contradiction that NamedLayer name could be symbolization layer name, but a requirement that is must be the collection ID
• The requirement now accepts either NamedLayer Name or FeatureTypeName/CoverageName as collection id
• The recommendartion is that FeatureTypeName/CoverageName be the collection id
• Removed the recommendation that NamedLayer Name and FeatureTypeName/CoverageName be consistent as it is contradictory with the recognition that the NamedLayer name could be symbolization layer name
• Keeping the note that clients should be prepared to treat NamedLayer name as collection id if no FeatureTypeName/CoverageName is present