Update proposed/clock-meta.md

Co-authored-by: Alexander Makarov <[email protected]>

Author: heiglandreas

proposed/clock-meta.md

@@ -168,6 +168,6 @@ The explicit contract that is defined by the interface does not limit a user in
 tries to solve the problem of getting the current time in a reliable way. Which view on the current time 
 that is, is not part of the explicit contract.
 
-So all in all: This interface tries to be as open as possible while at the same time being as 
+So, all in all: This interface tries to be as open as possible while at the same time being as 
 strict as necessary.