Update requirements for doc building

Remove unecessary requirements
Allow lfdocs-conf to initialise at latest version (0.7.7)
It now loads all centralized upper contraints from ONAP doc

Issue-ID: CPS-704
Signed-off-by: lukegleeson <luke.gleeson@est.tech>
Change-Id: I306fae3e8487f38e67212ba847260726aff065bf
diff --git a/docs/tox.ini b/docs/tox.ini
index edac8c3..4e9449e 100644
--- a/docs/tox.ini
+++ b/docs/tox.ini
@@ -6,6 +6,8 @@
 [testenv:docs]
 basepython = python3
 deps = -r{toxinidir}/requirements-docs.txt
+       -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt
+       -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt
 commands =
     sphinx-build -b html -n -d {envtmpdir}/doctrees ./ {toxinidir}/_build/html
     echo "Generated docs available in {toxinidir}/_build/html"
@@ -16,7 +18,9 @@
 
 [testenv:docs-linkcheck]
 basepython = python3
-#deps = -r{toxinidir}/requirements-docs.txt
+deps = -r{toxinidir}/requirements-docs.txt
+       -chttps://git.onap.org/doc/plain/etc/upper-constraints.os.txt
+       -chttps://git.onap.org/doc/plain/etc/upper-constraints.onap.txt
 commands = echo "Link Checking not enforced"
 #commands = sphinx-build -b linkcheck -d {envtmpdir}/doctrees ./ {toxinidir}/_build/linkcheck
 whitelist_externals = echo