Doc update on `FullFactorisation` following its name change to `BetheFactoridation`

[Raphael-Tresor]

Change on page /docs/src/manuals/model-specification part ####Factorisation-constraint-option :

• Replace FullFactorisation by BetheFactorisation every where in the documentation.

• On the same part /1. MeanField() ,add the word "naive" to "mean field" for it to create no confusion with the generalised mean field

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 79.42%. Comparing base (495baa7) to head (6b0cdc1).

Files	Patch %	Lines
src/graphppl.jl	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #237 +/- ## ========================================== - Coverage 80.32% 79.42% -0.90% ========================================== Files 11 11 Lines 1291 1293 +2 ========================================== - Hits 1037 1027 -10 - Misses 254 266 +12 ```

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[bvdmitri]

Hey @Raphael-Tresor , thanks for taking over this. Please take a look at this guide to test this change together with the dev-ed version of ReactiveMP (basically you need to use make devtest for that, but first you need to ] dev all the core packages, let me know if you have an issue with that)

[bvdmitri]

Thanks @Raphael-Tresor !