Headings on mobile do not work properly as per GUI Kit

[kkartunov]

Will need to fix headings on mobile as per https://marvelapp.com/4f8i35i/screen/61272611/handoff

[kkartunov]

Tests:

• community - https://community-app.topcoder.com/examples/contentful/contentblock/x0Qo7c5N1yQELR11LDhdD
• thrive - https://community-app.topcoder-dev.com/examples/contentful/article/7auxO4Dvh5YhPaVpUddPse?space=EDU

[SathyaJayabal]

verified on test

[sandhiyakavi]

verified on Beta env,working as expected.