Release Notes Need Editing for v6.13.0

[cailafinn]

Each of the following files need to be reviewed and edited before release:

• Edit v6.13.0 Diffraction Release Notes #39503
• Edit Release Notes for the Mantid Framework #39489
• Direct, Indirect, Inelastic, & Muon Release Notes for v6.13.0 #39508
• Edit Mantid Workbench Release Notes for v6.13.0 #39520
• Edit v6.13.0 Reflectometry Release Notes #39496
• Edit v6.13.0 SANS Release Notes #39479
• Final Tidy for v6.13.0 Release Notes #39583