doc SYNOPSIS: consistently use ' for commands

Most of our commands use ''-quotation only for the name of the command
itself, and not its (optional) arguments. Let's do the same for these.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

Documentation/git-fast-export.txt

@@ -9,7 +9,7 @@ git-fast-export - Git data exporter
 SYNOPSIS
 --------
 [verse]
-'git fast-export [<options>]' | 'git fast-import'
+'git fast-export' [<options>] | 'git fast-import'
 
 DESCRIPTION
 -----------

Documentation/git-sparse-checkout.txt

@@ -9,7 +9,7 @@ git-sparse-checkout - Reduce your working tree to a subset of tracked files
 SYNOPSIS
 --------
 [verse]
-'git sparse-checkout <subcommand> [<options>]'
+'git sparse-checkout' <subcommand> [<options>]
 
 
 DESCRIPTION