Update blank-issue.md

[lasryariel]

added Feature: Missing and Complexity: Missing to default labels

Closes #replace_this_text_with_the_issue_number

What changes did you make?

• Added labels from the missing series

Rationale behind the changes?

• If the issues start off with the missing labels, the author will be more likely to add those labels on the issue when writing it.

Testing done for these changes

• Checked for Completeness and Capitalization

• What did you learn or can share that is new?(optional)

  -

Screenshots of Proposed Changes Of The Website (if any, please do not screen shot code changes)

Visuals before changes are applied


Visuals after changes are applied


[ExperimentsInHonesty]

@lasryariel I am closing this PR. But an additional change needs to be made to update the text reminder from

**UPDATE LABELS: Add the following labels to each new issue, and remove defaults:**
* Role
* Feature
* Points 
* Milestone

to

**UPDATE LABELS: Add the following labels to each new issue, and remove defaults:**
* Role
* Feature
* Points 
* Milestone
* Complexity