Update Zygote requirement to 0.7.10 in /docs (#203)

Updates the requirements on [Zygote](https://github.com/FluxML/Zygote.jl) to permit the latest version.
- [Release notes](https://github.com/FluxML/Zygote.jl/releases)
- [Commits](FluxML/Zygote.jl@v0.2.0...v0.7.10)

---
updated-dependencies:
- dependency-name: Zygote
  dependency-version: 0.7.10
  dependency-type: direct:production
...

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docs/Project.toml

@@ -21,3 +21,4 @@ Documenter = "1.3"
 ForwardDiff = "1.3.1"
 Literate = "2.21.0"
 NLsolve = "4.5.1"
+Zygote = "0.7.10"