update getting started to tracer registry

[naseemkullah]

fixes #682

[codecov-io]

Codecov Report

Merging #709 into master will increase coverage by 1.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #709      +/-   ##
==========================================
+ Coverage   90.92%   92.57%   +1.65%     
==========================================
  Files         220      221       +1     
  Lines       10302    10195     -107     
  Branches      946      926      -20     
==========================================
+ Hits         9367     9438      +71     
+ Misses        935      757     -178

Impacted Files	Coverage Δ
packages/opentelemetry-plugin-https/src/https.ts	100% <0%> (ø)	⬆️
...ntelemetry-plugin-https/test/utils/httpsRequest.ts	95.23% <0%> (ø)	⬆️
...ges/opentelemetry-plugin-https/test/utils/utils.ts	60% <0%> (ø)	⬆️
...in-dns/test/integrations/dnspromise-lookup.test.ts	91.58% <0%> (ø)	⬆️
...emetry-plugin-https/test/utils/DummyPropagation.ts	100% <0%> (ø)	⬆️
...n-postgres/opentelemetry-plugin-pg/test/pg.test.ts	94.29% <0%> (ø)	⬆️
...lugin-https/test/functionals/https-disable.test.ts	100% <0%> (ø)	⬆️
.../opentelemetry-exporter-collector/src/transform.ts	88.88% <0%> (-8.09%)	⬇️
...lugin-https/test/integrations/https-enable.test.ts	94.35% <0%> (ø)	⬆️
...ry-plugin-dns/test/functionals/dns-disable.test.ts	100% <0%> (ø)	⬆️
... and 64 more

[OlivierAlbertini]

I believe that Registry should be renamed to Provider, can you confirm @dyladan ? Related to #699

[mayurkale22]

I believe that Registry should be renamed to Provider, can you confirm @dyladan ? Related to #699

I think the decision is not yet made on the name, for now we should continue with Registry and come back to this in the future.

[mayurkale22]

lgtm