display cmdparamdesc in optparse-applicative usage messages

Since optparse-applicative display "FOO" as "[FOO]", the paramOptional
modifier which wrapped it in square brackets was removed from most places.

Command/Help.hs

@@ -23,7 +23,7 @@ import System.Console.GetOpt
 
 cmd :: Command
 cmd = noCommit $ noRepo startNoRepo $ dontCheck repoExists $
-	command "help" (paramOptional "COMMAND") seek SectionCommon "display help"
+	command "help" "COMMAND" seek SectionCommon "display help"
 
 seek :: CommandSeek
 seek = withWords start

Command/Info.hs

@@ -80,7 +80,7 @@ type StatState = StateT StatInfo Annex
 
 cmd :: Command
 cmd = noCommit $ dontCheck repoExists $ withOptions (jsonOption : bytesOption : annexedMatchingOptions) $
-	command "info" (paramOptional $ paramRepeating paramItem) seek SectionQuery
+	command "info" (paramRepeating paramItem) seek SectionQuery
 	"shows information about the specified item or the repository as a whole"
 
 seek :: CommandSeek

Command/ReKey.hs

@@ -20,7 +20,7 @@ import qualified Remote
 
 cmd :: Command
 cmd = notDirect $ command "rekey"
-	(paramOptional $ paramRepeating $ paramPair paramPath paramKey)
+	(paramRepeating $ paramPair paramPath paramKey)
 	seek SectionPlumbing "change keys used for files"
 
 seek :: CommandSeek

Command/Sync.hs

@@ -53,7 +53,7 @@ import qualified Data.Map as M
 
 cmd :: Command
 cmd = withOptions syncOptions $
-	command "sync" (paramOptional (paramRepeating paramRemote))
+	command "sync" (paramRepeating paramRemote)
 	seek SectionCommon "synchronize local repository with remotes"
 
 syncOptions :: [Option]

Command/VPop.hs

@@ -18,7 +18,7 @@ import Command.View (checkoutViewBranch)
 
 cmd :: Command
 cmd = notBareRepo $ notDirect $
-	command "vpop" (paramOptional paramNumber) seek SectionMetaData
+	command "vpop" paramNumber seek SectionMetaData
 	"switch back to previous view"
 
 seek :: CommandSeek