docs: fix by proofreading

Co-authored-by: John Paul E. Balandan, CPA <51850998+paulbalandan@users.noreply.github.com>

Author: kenjis

user_guide_src/source/installation/index.rst

@@ -7,7 +7,7 @@ using `Composer <https://getcomposer.org>`_, or using
 `Git <https://git-scm.com/>`_.
 Which is right for you?
 
-- We recommend the Composer installation. Because it keeps CodeIgniter up to date easily.
+- We recommend the Composer installation because it keeps CodeIgniter up to date easily.
 - If you would like the simple "download & go" install that CodeIgniter3
   is known for, choose the manual installation.