Update crates/mtc_worker/README.md

Co-authored-by: Luke Valenta <lvalenta@cloudflare.com>

Author: cjpatton

crates/mtc_worker/README.md

@@ -18,7 +18,7 @@ Then use `wrangler` to run the Worker locally from this directory:
 npx wrangler dev -e=dev
 ```
 
-The Worker doesn't implement a full-blown MTCA. Instead, it implements what we call a **bootstrap MTCA**. For every MTC requested, the requester must provide a **bootstrap certificate**. A bootstrap certificate is a standard X.509 certificate chain that must have a path to a root certificate trusted by `mtc_worker`. By default, the root store for is the intersection of Chrome's and Mozilla's trust stores.
+The Worker doesn't implement a full-blown MTCA. Instead, it implements what we call a **bootstrap MTCA**. For every MTC requested, the requester must provide a **bootstrap certificate**. A bootstrap certificate is a standard X.509 certificate chain that must have a path to a root certificate trusted by `mtc_worker`. By default, the root store used is the intersection of Chrome's and Mozilla's trust stores.
 
 To test the basic functionality, run the following script from this directory: