fix capitalization

source/initial-dns-seedlist-discovery/initial-dns-seedlist-discovery.md

@@ -82,7 +82,7 @@ It is an error to specify more than one host name in a connection string with th
 MUST raise a parse error and MUST NOT do DNS resolution or contact hosts.
 
 A driver MUST verify that in addition to the `{hostname}`, the `{domainname}` consists of at least two parts: the domain
-name, and a TLD. In the case that an SRV or TXT record does not have three parts prior to DNS resolution, drivers must NOT throw an error.
+name, and a TLD. In the case that an SRV or TXT record does not have three parts prior to DNS resolution, drivers MUST NOT throw an error.
 
 If `mongodb+srv` is used, a driver MUST implicitly also enable TLS. Clients can turn this off by passing `tls=false` in
 either the Connection String, or options passed in as parameters in code to the MongoClient constructor (or equivalent