Correct errors in docs.

Issue-ID: NONRTRIC-887
Change-Id: I4b443154aa4642a5f984fa8e0fd93ad0a9f3d2b1
Signed-off-by: ktimoney <kevin.timoney@est.tech>
diff --git a/tox.ini b/tox.ini
index 3a1149e..ffbcb1b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,12 +16,12 @@
 
 [tox]
 envlist = code,docs,docs-linkcheck
-minversion = 2.0
+minversion = 4.0
 skipsdist = true
 
 ; basic test and coverage jobs
 [testenv:code]
-basepython = python3.8
+basepython = python3
 deps=
     pytest
     coverage
@@ -48,7 +48,7 @@
 # doc jobs
 [testenv:docs]
 allowlist_externals = echo
-basepython = python3.8
+basepython = python3
 deps = -r{toxinidir}/docs/requirements-docs.txt
 commands =
     sphinx-build -W -b html -n -d {envtmpdir}/doctrees ./docs/ {toxinidir}/docs/_build/html
@@ -56,7 +56,7 @@
 
 [testenv:docs-linkcheck]
 skipsdist = true
-basepython = python3.8
+basepython = python3
 deps = -r{toxinidir}/docs/requirements-docs.txt
 commands =
     sphinx-build -W -b linkcheck -d {envtmpdir}/doctrees ./docs/ {toxinidir}/docs/_build/linkcheck