Formatted text in Tutorial pageviews

[gupta-meghna64]

Description

This formats the text properly in all the tutorial layout pages, which enhance the UI of the application.
The PR fixes #1196

Changes Made

Instead of a '-', bullet points were used. New line spaces were properly indented after the bullet marks.
The changes were made to the following xml pages:

1. welcome_do_upload.xml(2)
2. welcome_dont_upload.xml(2)
3. welcome_image_details.xml(2)

Screenshots of sample changes

This is one of the changes

Before

After

Device and Android Version

Redmi Note 3 and 6.0.1 MB29M

[codecov-io]

Codecov Report

Merging #1210 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1210   +/-   ##
======================================
  Coverage    3.82%   3.82%           
======================================
  Files         125     125           
  Lines        5810    5810           
  Branches      568     568           
======================================
  Hits          222     222           
  Misses       5573    5573           
  Partials       15      15

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[maskaravivek]

@gupta-meghna64 I am not able to view the screenshots. Can you check if they were properly uploaded.

[gupta-meghna64]

Sorry for that. I've updated the links. Please review :-)

[maskaravivek]

Tested on a real device. Works perfectly. Thanks for the PR @gupta-meghna64.