Rename extras to align with core metadata spec.

Closes jaraco/skeleton#125.

.readthedocs.yaml

@@ -3,7 +3,7 @@ python:
   install:
   - path: .
     extra_requirements:
-      - docs
+      - doc
 
 # required boilerplate readthedocs/readthedocs.org#10401
 build:

pyproject.toml

@@ -25,7 +25,7 @@ dynamic = ["version"]
 Homepage = "https://github.com/PROJECT_PATH"
 
 [project.optional-dependencies]
-testing = [
+test = [
 	# upstream
 	"pytest >= 6, != 8.1.*",
 	"pytest-checkdocs >= 2.4",
@@ -36,7 +36,7 @@ testing = [
 
 	# local
 ]
-docs = [
+doc = [
 	# upstream
 	"sphinx >= 3.5",
 	"jaraco.packaging >= 9.3",

tox.ini

@@ -7,7 +7,7 @@ commands =
 	pytest {posargs}
 usedevelop = True
 extras =
-	testing
+	test
 
 [testenv:diffcov]
 description = run tests and check that diff from main is covered
@@ -22,8 +22,8 @@ commands =
 [testenv:docs]
 description = build the documentation
 extras =
-	docs
-	testing
+	doc
+	test
 changedir = docs
 commands =
 	python -m sphinx -W --keep-going . {toxinidir}/build/html