Update docs/cli/build/index.md

Co-authored-by: Dan Čermák <[email protected]>

docs/cli/build/index.md

@@ -33,6 +33,6 @@ Subcommand that groups all RPM build related commands together.
       in-copr  Build selected upstream project in Copr.
       in-image-builder  Create a VM image in Image Builder.
       in-koji  Build selected upstream project in Fedora.
-      in-obs   Build selected repository in Open Build Service
+      in-obs   Build selected repository in the Open Build Service
       in-mock  Build RPMs in mock using content of the upstream repository.
       locally  Create RPMs using content of the upstream repository.