Add a params v3 page to the specs

[ninabarbakadze]

          Overall LGTM. We'll also need to add a params v3 page to the specs and mark the params: `blob.GasPerBlobByte` and `auth.TxSizeCostPerByte` as non governance modifiable on that page. 

Ref: https://github.com/celestiaorg/celestia-app/blob/main/specs/src/specs/parameters_v2.md

Originally posted by @rootulp in #3735 (review)

[rootulp]

The parameters v3 page isn't visible on https://celestiaorg.github.io/celestia-app/parameters.html. We need to add it to:

• celestia-app/specs/src/SUMMARY.md

  Lines 24 to 26 in 983385a

  	- [Parameters](./parameters.md)
  	- [Parameters v1](./parameters_v1.md)
  	- [Parameters v2](./parameters_v2.md)

• celestia-app/specs/src/parameters.md

  Lines 5 to 6 in 983385a

  	- [Parameters v1](./parameters_v1.md)
  	- [Parameters v2](./parameters_v2.md)