Review and verify output of ballerina dist pull --help

[Kishanthan]

Description:

$ ballerina dist pull --help
NAME
       ballerina-dist-pull - Pull and use a given distribution version

SYNOPSIS
       ballerina dist pull <distribution-version>


DESCRIPTION
       Dist-pull pulls and uses a given Ballerina version from project repository.


OPTIONS
       Ballerina dist pull command takes no options.


EXAMPLES
       Install Ballerina 1.0.0 version.
          → ballerina dist pull jballerina-1.0.0

       This will download and keep jballerina-1.0.0 distribution and set ballerina command.

Issues

1. Fix grammer issues in
   DESCRIPTION Dist-pull pulls and uses a given Ballerina version from project repository.
2. Fix this text This will download and keep jballerina-1.0.0 distribution and set ballerina command. This setance does not have a meaning IMO.
3. Remove the OPTIONS as if the command does not take any, its no point showing that in the text.

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Affected Product Version:

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Steps to reproduce:

Related Issues:

[MaryamZi]

Fixed with #329