Improve in-app help

Author: mpilgrem

src/Stack/Options/BuildParser.hs

@@ -42,7 +42,8 @@ buildOptsParser cmd = BuildOptsCLI
             (  long "ghc-options"
             <> metavar "OPTIONS"
             <> completer ghcOptsCompleter
-            <> help "Additional options passed to GHC"
+            <> help "Additional options passed to GHC (can be specified \
+                    \multiple times)"
             ))
       )
   <*> flagsParser

src/Stack/Options/GhciParser.hs

@@ -43,15 +43,17 @@ ghciOptsParser = GhciOpts
               (  long "ghci-options"
               <> metavar "OPTIONS"
               <> completer ghcOptsCompleter
-              <> help "Additional options passed to GHCi"
+              <> help "Additional options passed to GHCi (can be specified \
+                      \multiple times)"
               ))
       )
   <*> (     concat
         <$> many (argsOption
               (  long "ghc-options"
               <> metavar "OPTIONS"
               <> completer ghcOptsCompleter
-              <> help "Additional options passed to both GHC and GHCi"
+              <> help "Additional options passed to both GHC and GHCi (can be \
+                      \specified multiple times)"
               ))
       )
   <*> flagsParser

src/Stack/Options/ScriptParser.hs

@@ -66,7 +66,8 @@ scriptOptsParser = ScriptOpts
         (  long "ghc-options"
         <> metavar "OPTIONS"
         <> completer ghcOptsCompleter
-        <> help "Additional options passed to GHC"
+        <> help "Additional options passed to GHC (can be specified multiple \
+                \times)"
         ))
   <*> many (option extraDepRead
         (  long "extra-dep"