[docs] remove MathOptSymbolicAD from packages.toml (#4143)

Author: odow

docs/packages.toml

@@ -199,10 +199,6 @@
 [MathOptChordalDecomposition]
     user = "samuelsonric"
     rev = "v0.2.0"
-[MathOptSymbolicAD]
-    user = "lanl-ansi"
-    rev = "v0.2.2"
-    extension = true
 [Optim]
     user = "JuliaNLSolvers"
     rev = "v2.0.1"

docs/src/changelog.md

@@ -264,7 +264,7 @@ There are no new features.
 ### Other
 
  - Various minor improvements to the documentation (#3855) (#3860)
- - Added [MathOptAI.jl](@ref) and [MathOptSymbolicAD.jl](@ref) to the list of extensions in the documentation (#3858)
+ - Added [MathOptAI.jl](@ref) and `MathOptSymbolicAD.jl` to the list of extensions in the documentation (#3858)
  - Clarified [`add_to_expression!`](@ref) can add two expressions (#3859)
  - Added `SHOT` to the installation table (#3853)
  - Improvements to test coverage (#3867) (#3868) (#3869) (#3870) (#3871) (#3872)