Remove useless pinned dep in template

templates/requirements.docs.txt

-#
-# This file is autogenerated by pip-compile
-# To update, run:
-#
-#    pip-compile requirements.docs.in
-#
-astunparse==1.6.3
-    # via pytkdocs
-babel==2.9.1
-    # via mkdocs-git-revision-date-localized-plugin
-click==7.1.2
-    # via
-    #   mkdocs
-    #   nltk
-docopt==0.6.2
-    # via pykwalify
-future==0.18.2
-    # via lunr
-gitdb==4.0.7
-    # via gitpython
-gitpython==3.1.14
-    # via mkdocs-git-revision-date-localized-plugin
-jinja2==2.11.3
-    # via
-    #   mkdocs
-    #   mkdocs-macros-plugin
-    #   mkdocstrings
-joblib==1.0.1
-    # via nltk
-livereload==2.6.3
-    # via mkdocs
-lunr[languages]==0.5.8
-    # via mkdocs
-markdown-include==0.6.0
-    # via -r requirements.docs.in
-markdown==3.3.4
-    # via
-    #   markdown-include
-    #   mkdocs
-    #   mkdocs-autorefs
-    #   mkdocs-material
-    #   mkdocstrings
-    #   pymdown-extensions
-markupsafe==1.1.1
-    # via
-    #   jinja2
-    #   mkdocstrings
-mkdocs-autorefs==0.1.1
-    # via mkdocstrings
-mkdocs-exclude==1.0.2
-    # via -r requirements.docs.in
-mkdocs-git-revision-date-localized-plugin==0.9.2
-    # via -r requirements.docs.in
-mkdocs-macros-plugin==0.5.5
-    # via -r requirements.docs.in
-mkdocs-material-extensions==1.0.1
-    # via mkdocs-material
-mkdocs-material==7.1.4
-    # via
-    #   -r requirements.docs.in
-    #   mkdocs-macros-plugin
-    #   mkdocs-material-extensions
-mkdocs-monorepo-plugin==0.4.14
-    # via -r requirements.docs.in
-mkdocs-section-index==0.3.0
-    # via -r requirements.docs.in
-mkdocs==1.1.2
-    # via
-    #   -r requirements.docs.in
-    #   mkdocs-autorefs
-    #   mkdocs-exclude
-    #   mkdocs-git-revision-date-localized-plugin
-    #   mkdocs-macros-plugin
-    #   mkdocs-material
-    #   mkdocs-monorepo-plugin
-    #   mkdocs-section-index
-    #   mkdocstrings
-mkdocstrings==0.15.0
-    # via -r requirements.docs.in
-nltk==3.6.2
-    # via lunr
-pygments==2.9.0
-    # via mkdocs-material
-pykwalify==1.8.0
-    # via -r requirements.docs.in
-pymdown-extensions==8.1.1
-    # via
-    #   mkdocs-material
-    #   mkdocstrings
-python-dateutil==2.8.1
-    # via
-    #   mkdocs-macros-plugin
-    #   pykwalify
-pytkdocs==0.11.1
-    # via mkdocstrings
-pytz==2021.1
-    # via babel
-pyyaml==5.4.1
-    # via
-    #   mkdocs
-    #   mkdocs-macros-plugin
-regex==2021.4.4
-    # via nltk
-ruamel.yaml.clib==0.2.2
-    # via ruamel.yaml
-ruamel.yaml==0.17.4
-    # via pykwalify
-six==1.16.0
-    # via
-    #   astunparse
-    #   livereload
-    #   lunr
-    #   python-dateutil
-smmap==4.0.0
-    # via gitdb
-termcolor==1.1.0
-    # via mkdocs-macros-plugin
-tornado==6.1
-    # via
-    #   livereload
-    #   mkdocs
-tqdm==4.60.0
-    # via nltk
-wheel==0.36.2
-    # via astunparse