161 workover chapter 71 introduction

[ClemensLinnhoff]

Describe your changes

• [x] Restructure geometry chapter introduction
• [x] Editorial changes
• [x] Added interaction with other ASAM standards

Issue ticket number and link

Fixes #161, fixes #160

Checklist before requesting a review

• [x] I have performed a self-review of my code/documentation.
• [x] My changes generate no new warnings during the documentation generation.

[ClemensLinnhoff]

@FKlopfer could you do an editorial review?

[FKlopfer]

Editorial review done.