gh-37213: fix a wrong reference in installation manual
In the second paragraph of
"https://doc.sagemath.org/html/en/installation/launching.html", the
reader is "strongly advised to create shortcuts for Sage as indicated at
the end of the “Linux” Section in [Install from Pre-Built
Binaries](https://doc.sagemath.org/html/en/installation/binary.html#sec-
installation-from-binaries)". However, the indicated part in the
reference "[Install from Pre-Built
Binaries](https://doc.sagemath.org/html/en/installation/binary.html#sec-
installation-from-binaries)" does not exist anymore, and should be
replaced by "[Installation steps](https://deploy-preview-37213--
sagemath.netlify.app/html/en/installation/source#build-from-source-step-
by-step)".
### :memo: Checklist
- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation accordingly.
### :hourglass: Dependencies
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URL: https://github.com/sagemath/sage/pull/37213
Reported by: 6mingkun
Reviewer(s): Frédéric Chapoton
Committer
Release Manager