Fix typo in Interop 2023 README

Author: foolip

2023/README.md

@@ -18,7 +18,7 @@ If you've had problems using a feature on the web because of differences between
 Before making a proposal, here's what to expect:
 
 - There are two kinds of proposals:
-  - **Focus Area**: Most proposals should fall into the category, where the goal is for browsers to pass a set of tests for a feature. Only features which have high quality specifications and tests are in scope.
+  - **Focus Area**: Most proposals should fall into this category, where the goal is for browsers to pass a set of tests for a feature. Only features which have high quality specifications and tests are in scope.
   - **Investigation Effort**: If a feature is widely implemented, but lacks a high quality specification or tests, an investigation effort may be appropriate. An investigation efforts consists of a set of tasks that will bring the feature up to the bar required for a Focus Area in the future. If this involves any standards work, that work must be done in the appropriate standards group, and those doing the work need to join those groups.
 - Interop 2023 is not a venue for specifying new features; that work happens in working groups within organizations such as W3C and WHATWG.
 - Interop 2023 is not a process for making browser vendors work on things they're opposed to. Decisions are made by consensus, so highly contentious features are unlikely to be accepted.