Update GitHub Models doc to not include Phi-3 and Phi-3.5 models in costs (#57447)

Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>

Author: stephaniegiang

content/billing/reference/costs-for-github-models.md

@@ -30,15 +30,6 @@ The table below lists the currently available models. Each model supported by {%
 | OpenAI GPT-4o mini                | 0.015            | 0.0075                  | 0.06              | $0.15                            | $0.08                                   | $0.60                             |
 | OpenAI GPT-4.1-mini               | 0.04             | 0.01                    | 0.16              | $0.40                            | $0.10                                   | $1.60                             |
 | OpenAI GPT-4.1                    | 0.2              | 0.05                    | 0.8               | $2.00                            | $0.50                                   | $8.00                             |
-| Phi-3.5-MoE instruct (128k)       | 0.016            | N/A                     | 0.064             | $0.16                            | N/A                                     | $0.64                             |
-| Phi-3.5-mini instruct (128k)      | 0.013            | N/A                     | 0.052             | $0.13                            | N/A                                     | $0.52                             |
-| Phi-3.5-vision instruct (128k)    | 0.013            | N/A                     | 0.052             | $0.13                            | N/A                                     | $0.52                             |
-| Phi-3-medium instruct (4k)        | 0.017            | N/A                     | 0.068             | $0.17                            | N/A                                     | $0.68                             |
-| Phi-3-medium instruct (128k)      | 0.017            | N/A                     | 0.068             | $0.17                            | N/A                                     | $0.68                             |
-| Phi-3-mini instruct (4k)          | 0.013            | N/A                     | 0.052             | $0.13                            | N/A                                     | $0.52                             |
-| Phi-3-mini instruct (128k)        | 0.013            | N/A                     | 0.052             | $0.13                            | N/A                                     | $0.52                             |
-| Phi-3-small instruct (8k)         | 0.015            | N/A                     | 0.06              | $0.15                            | N/A                                     | $0.60                             |
-| Phi-3-small instruct (128k)       | 0.015            | N/A                     | 0.06              | $0.15                            | N/A                                     | $0.60                             |
 | Phi-4                             | 0.0125           | N/A                     | 0.05              | $0.13                            | N/A                                     | $0.50                             |
 | Phi-4-mini-instruct               | 0.0075           | N/A                     | 0.03              | $0.08                            | N/A                                     | $0.30                             |
 | Phi-4-multimodal-instruct         | 0.008            | N/A                     | 0.032             | $0.08                            | N/A                                     | $0.32                             |