docs: fix by proofreading

kenjis · MGatner · web-flow · commit 56b360aa0572 · 2022-08-02T16:00:07.000+09:00
Co-authored-by: MGatner &lt;mgatner@icloud.com&gt;
diff --git a/user_guide_src/source/installation/installing_composer.rst b/user_guide_src/source/installation/installing_composer.rst
@@ -55,8 +55,8 @@ A sample such installation command, using the default project-root "appstarter":
 Initial Configuration
 ---------------------
 
-After installation, a few initial configuration is required.
-See :ref:`initial-configuration` for the detail.
+After installation, a few initial configurations are required.
+See :ref:`initial-configuration` for the details. 
 
 .. _app-starter-upgrading:
 
