;update CLI usage texts

hledger/Hledger/Cli/Commands/Check.txt

@@ -16,7 +16,8 @@ Here are the checks currently available:
 
 Basic checks
 
-These are always run by this command and other commands:
+These checks are always run automatically, by (almost) all hledger
+commands, including check:
 
 -   parseable - data files are well-formed and can be successfully
     parsed
@@ -30,8 +31,9 @@ These are always run by this command and other commands:
 
 Strict checks
 
-These are always run by this and other commands when -s/--strict is used
-(strict mode):
+These additional checks are run when the -s/--strict (strict mode) flag
+is used. They can also be run by specifying their names as arguments to
+check:
 
 -   accounts - all account names used by transactions have been declared
 
@@ -39,19 +41,21 @@ These are always run by this and other commands when -s/--strict is used
 
 Other checks
 
-These checks can be run by specifying their names as arguments to the
-check command:
+These checks can be run only by specifying their names as arguments to
+check:
 
 -   ordereddates - transactions are ordered by date (similar to the old
     check-dates command)
 
+-   payees - all payees used by transactions have been declared
+
 -   uniqueleafnames - all account leaf names are unique (similar to the
     old check-dupes command)
 
 Add-on checks
 
-Some checks are not yet integrated with this command, but are available
-as add-on commands in
+These checks are not yet integrated with check, but are available as
+add-on commands in
 https://github.com/simonmichael/hledger/tree/master/bin:
 
 -   hledger-check-tagfiles - all tag values containing / (a forward