Add section about combining changes

Dependencies

• [2] QNQW6SIV Create page "Splitting and combining changes"

Change contents

• edit in src/workflows/splitting_and_combining_changes.md at line 280
  [2.7594]
  +

  + ## Combining changes

  +

  + To combine multiple changes into one, there currently is no better way than

  + running `pijul unrecord` on all changes you want to combine, and then again

  + `pijul record` them as described above.