ShellPkg: Refine the code style and comment.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: : Jaben Carsey <Jaben.carsey@intel.com>


git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/ShellPkg@16061 6f19259b-4bc3-4df7-8a09-765794883524
ShellPkg: Not add redundant quotes any longer to parameters with spaces.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <Jaben.carsey@intel.com>
Reviewed-by: : Qiu Shumin <shumin.qiu@intel.com>


git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/ShellPkg@16062 6f19259b-4bc3-4df7-8a09-765794883524