Improve docs on embedders

[sgrava]

Embedder

• typo in [*algorithm](https://pasqal-io.github.io/qoolqit/latest/api/qoolqit/embedding/algorithms/)* section at the bottom of the page: Sed → Seed
• it would help the reader to have reminded of the method base class method embed which is used to actually create an embedded graph for both [*graph_embedder](https://pasqal-io.github.io/qoolqit/latest/api/qoolqit/embedding/graph_embedder/) and [matrix_embedder](https://pasqal-io.github.io/qoolqit/latest/api/qoolqit/embedding/matrix_embedder/)*