Fix duplicate phrase about poetry (#799)

Co-authored-by: Pradyun Gedam <3275593+pradyunsg@users.noreply.github.com>

Author: pinealan

source/key_projects.rst

@@ -547,11 +547,10 @@ poetry
 
 poetry is a command-line tool to handle dependency installation and
 isolation as well as building and packaging of Python packages. It
-uses ``pyproject.toml`` and provides its own dependency resolver, and,
-instead of depending on the resolver functionality within :ref:`pip`,
-provides its own dependency resolver. It attempts to speed users'
-experience of installation and dependency resolution by locally
-caching metadata about dependencies.
+uses ``pyproject.toml`` and, instead of depending on the resolver
+functionality within :ref:`pip`, provides its own dependency resolver.
+It attempts to speed users' experience of installation and dependency
+resolution by locally caching metadata about dependencies.
 
 .. _pypiserver: