[Merged by Bors] - chore: replace right_deriv by rightDeriv in lemma names

[RemyDegenne]

And similarly for left_deriv.

There is no leftDeriv or rightDeriv definition (they refer to a derivWithin in an interval) but they have a similar role in lemma names so should be written in the same way as definitions.

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[github-actions]

PR summary b2df5ca6b4

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ leftDeriv_le_slope
+ leftDeriv_lt_slope
+ rightDeriv_le_slope
+ rightDeriv_lt_slope
+ slope_le_leftDeriv
+ slope_le_rightDeriv
+ slope_lt_leftDeriv
+ slope_lt_rightDeriv

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[YaelDillies]

There is no leftDeriv or rightDeriv definition

Maybe they should be? x appears twice in derivWithin f (Ioi x) x, and that's usually taken to be the point at which it's worth making a function.

Anyway, this PR looks good, thanks!

maintainer merge

[github-actions]

🚀 Pull request has been placed on the maintainer queue by YaelDillies.

[sgouezel]

bors r+
Thanks!

[mathlib-bors]

Pull request successfully merged into master.

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