[DOCS] Addition to "How to invite users" section

[noetomaz]

Documentation Location

https://docs.semaphoreci.com/using-semaphore/organizations#add-people

Type of Documentation Issue

• Missing documentation
• Incorrect information
• Unclear explanation
• Outdated content
• Broken link
• Code example needs update
• Other (please describe): adding a specific piece of info to avoid confusion.

Current State

The public documents provide an easy guide with steps to add users. But in order to prevent confusion or errors during the process, the steps should emphasize the importance of entering the handle accurately.

Requested Changes

Add a sentence explaining that the GitHub/Bitbucket handle should be written exactly as it is (the system identifies upper-case, lower-case, hyphen, underscores), this could help users to be more careful while adding another members.

Suggested Content

In step number 1 ("1. Select one of the available tabs"), after the first sentence, we could add something like this:

1. Select one of the available tabs

• Type the user's handle, e.g. TomFern, or select the user from the list. The system is case-sensitive and considers all characters, so please ensure the handle is entered exactly to avoid errors.

Additional Information

Affects Version

• Cloud Semaphore
• Community Edition (specify version):

[TomFern]

Added this change on: #381

[TomFern]

Fix merged: #381