* add http metric label spec
* typo
* update attribute locations and clarify which to inlcude, alter and exclude
* add metric instruments list
* simplify intro sections, add requirement columns, clarify labels, fix normative directives and more
* fix HTTP strings
* add count metric instrument and shorten duration metric name
* remove dependency on http.md, add more notes and examples and general cleanup
* replace span.kind with type
* add missing labels and cleanup links
* substitution->alternatives and remove section not needed
* make request count metric instrument plural
* formatting
* clarify type column
* update intro and fix units
* breakout metric instrument table
* remove http.route since it is the same as http.target after http.target is simplified
* update net labels to link to definition
* add lowercase requirement to http.scheme
* formatting
Co-authored-by: gfuller <gfuller@newrelic.com>
Co-authored-by: Bogdan Drutu <bogdandrutu@gmail.com>
Justin Foote