Update docs

docs/src/lib/internals/finitestrains.md

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+# Finite strains
+
+```@autodocs
+Modules = [EquationsOfStateOfSolids.FiniteStrains]
+```

docs/src/lib/public/collections.md

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+# Collections
+
+## Contents
+
+```@contents
+Pages = ["collections.md"]
+Depth = 2:2
+```
+
+The current `EquationOfStateOfSolidsParameters` are
+
+```@repl
+using TypeTree
+tt(EquationsOfStateOfSolids.EquationOfStateOfSolidsParameters)
+```
+
+Here the leaves of the type tree are concrete types and can be constructed.
+
+## Index
+
+```@index
+Pages = ["collections.md"]
+```
+
+## Public interface
+
+```@docs
+Murnaghan1st
+BirchMurnaghan
+BirchMurnaghan2nd
+BirchMurnaghan3rd
+BirchMurnaghan4th
+PoirierTarantola
+PoirierTarantola2nd
+PoirierTarantola3rd
+Vinet
+EnergyEquation
+PressureEquation
+BulkModulusEquation
+orderof
+real
+isreal
+float
+ustrip
+```

docs/src/lib/public/fitting.md

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+# Fitting
+
+## Contents
+
+```@contents
+Pages = ["fitting.md"]
+```
+
+## Index
+
+```@index
+Pages = ["fitting.md"]
+```
+
+## Public interface
+
+```@docs
+fit
+linfit
+nonlinfit
+```