[DOC] Spelling mistake lenght

[TonyBagnall]

Describe the issue linked to the documentation

this is a minor change to allow new contributors to figure out the github workflow and make a first minor contribution.

there are three occurrences of "lenght" instead of "length". Good first contribution is to correct this spelling mistake

[RishavKumarSinha]

Hello there! I want to claim this issue, can you please provide the link to file that consists of the spelling mistakes?

[TonyBagnall]

sure, search shows this