changed documentation from cosine distance to cosine similarity; fixe…
This PR updates the documentation for the CosineEmbeddingLoss.
The loss function uses the `cosine similarity` but in the documentation the term `cosine distance` is used. Therefor the term is changed to `cosine similarity`
Fixes #75104
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75188
Approved by: https://github.com/cpuhrsch
