Manual: rephrase definition for indented strings

[NotaseCretagen]

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • OS X
  • Linux
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

Did not test this in any way... please suggest a way to test(the manual?), if needed and/or for the future.

Text stolen from: https://nixos.org/nix/manual/#ssec-values

Closes #15076

[mention-bot]

By analyzing the blame information on this pull request, we identified @vcunat and @aneeshusa to be potential reviewers

[Profpatsch]

Nope, breaks the manual.

[Profpatsch]

Did not test this in any way... please suggest a way to test(the manual?), if needed and/or for the future.

Did you read the README in docs? nixos/doc/manual/README

[NotaseCretagen]

@Profpatsch I didn't... brb

[NotaseCretagen]

#15102

[NotaseCretagen]

yup, I get the same error...

$ time nix-build /etc/nixos/nixpkgs/nixos/release.nix -A manual.x86_64-linux
these derivations will be built:
/nix/store/zwphwyd8d0c3cqxpwrfdqnyqks2fb0rk-options-db.xml.drv
/nix/store/0s2q1sb94g96vi70ymf604610h2hxg7a-nixos-manual.drv
building path(s) ‘/nix/store/ksjryp29yplcq2p70xl02c4sjx7azzkh-options-db.xml’
building path(s) ‘/nix/store/vrs541a2n0dgwsy4q3wm201m4rki18m7-nixos-manual’
manual.xml:9: element partintro: Relax-NG validity error : Did not expect element partintro there
manual.xml:9: element para: Relax-NG validity error : Did not expect element para there
manual.xml:5: element section: Relax-NG validity error : Did not expect element section there
manual.xml:5: element section: Relax-NG validity error : Element chapter has extra content: section
manual.xml:5: element part: Relax-NG validity error : Element part failed to validate content
manual.xml fails to validate
builder for ‘/nix/store/0s2q1sb94g96vi70ymf604610h2hxg7a-nixos-manual.drv’ failed with exit code 3
error: build of ‘/nix/store/0s2q1sb94g96vi70ymf604610h2hxg7a-nixos-manual.drv’ failed

[Profpatsch]

@NotaseCretagen Take a look at your changes, try to find out what they do differently than the parts around them. ;)

[NotaseCretagen]

Shouldn't have this have detected it, btw: https://travis-ci.org/NixOS/nixpkgs/builds/126729080
(I mean, for future reference)