Fix: grammar in README.md (modular#1053)

Author: sarthak-2305

proposals/README.md

@@ -1,8 +1,8 @@
 # Mojo🔥 engineering design proposals
 
 This directory contains ad-hoc design proposals put together by the Mojo
-engineering team.  These are meant for to help shape discussion and refine the
-design of various subsystems, but typically get obsoleted and incorporated into
-more canonical documentation when the implementation work concludes.  There is
+engineering team. These are meant to help shape discussion and refine the
+design of various subsystems, but typically become obsolete and incorporated into
+more canonical documentation when the implementation work concludes. There is
 no attempt to keep these up-to-date as the language evolves, so they are
 more for historical reference than as a user-guide for the language.