minor #12458 Update UPGRADE-2.6.md (perajovic)
This PR was submitted for the master branch but it was merged into the 2.6 branch instead (closes #12458).
Discussion
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Update UPGRADE-2.6.md
| Q | A
| ------------- | ---
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | -
| Fixed tickets | -
| License | MIT
| Doc PR | -
Commits
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450e341
Update UPGRADE-2.6.md
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