Docs: Edit the 2.6.1 docs

[kirszenbaum]

This PR:

• Edits docs added or edited as part of the 2.6.1 release.
• Rewrites the Referring to named expressions section so it's less awkward.
• Replaces the "refer to sth" expression with "reference sth", where applicable.
• Adds commas missing after "e.g." and "i.d.".

[skip changelog]

[github-actions[bot]]

Performance comparison of head (0de8d2bcb4d560fbf6a7b48aa0c23689d3e52a02) vs base (78e734c89e665198ad14fbbb8cd0e094ef63b7b2)

                                     testName |   base |   head |  change
-------------------------------------------------------------------------
                                      Sheet A | 532.69 | 541.54 |  +1.66%
                                      Sheet B | 172.95 | 173.79 |  +0.49%
                                      Sheet T |  152.4 |    150 |  -1.57%
                                Column ranges | 553.76 | 546.87 |  -1.24%
Sheet A:  change value, add/remove row/column |     37 |     40 |  +8.11%
 Sheet B: change value, add/remove row/column |    281 |    290 |  +3.20%
                   Column ranges - add column |    162 |    147 |  -9.26%
                Column ranges - without batch |    391 |    550 | +40.66%
                        Column ranges - batch |    222 |     87 | -60.81%

[kirszenbaum]

@sequba – I removed the "fixed a typo" change from the changelog. On another note, the Error Types link in the left-hand menu seems to be broken

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (78e734c) 97.36% compared to head (c0c6cc0) 97.36%.

:exclamation: Current head c0c6cc0 differs from pull request most recent head 0de8d2b. Consider uploading reports for the commit 0de8d2b to get more accurate results

Additional details and impacted files

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[sequba]

Thanks a lot, @kirszenbaum.

I removed the "fixed a typo" change from the changelog.

I brought it back. We need it in the release notes because it was a contribution from an external dev.

On another note, the Error Types link in the left-hand menu seems to be broken

I'll have a look at it before releasing.