Rename OLMo November to OLMo2 (#34864)

* Rename/move OLMo Nov files to OLMo2

* Rename Olmo1124 and its variants to Olmo2

docs/source/en/model_doc/olmo2.md

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+
+# OLMo2
+
+## Overview
+
+The OLMo2 model is the successor of the OLMo model, which was proposed in
+[OLMo: Accelerating the Science of Language Models](https://arxiv.org/abs/2402.00838).
+
+ The architectural changes from the original OLMo model to this model are:
+
+- RMSNorm is used instead of standard layer norm.
+- Norm is applied to attention queries and keys.
+- Norm is applied after attention/feedforward layers rather than before.
+
+This model was contributed by [shanearora](https://huggingface.co/shanearora).
+The original code can be found [here](https://github.com/allenai/OLMo/tree/main/olmo).
+
+
+## Olmo2Config
+
+[[autodoc]] Olmo2Config
+
+## Olmo2Model
+
+[[autodoc]] Olmo2Model
+    - forward
+
+## Olmo2ForCausalLM
+
+[[autodoc]] Olmo2ForCausalLM
+    - forward