docs: add openai/gpt-5.5-pro (#365)

Author: Lookoff-AIMLAPI

docs/SUMMARY.md

@@ -260,6 +260,7 @@
     * [Gpt 5.3 Chat](api-references/text-models-llm/openai/gpt-5.3-chat.md)
     * [Gpt 5.4 Nano](api-references/text-models-llm/openai/gpt-5.4-nano.md)
     * [Gpt 5.4 Pro](api-references/text-models-llm/openai/gpt-5.4-pro.md)
+    * [Gpt 5.5 Pro](api-references/text-models-llm/openai/gpt-5.5-pro.md)
   * [Perplexity](api-references/text-models-llm/perplexity/README.md)
     * [Sonar](api-references/text-models-llm/perplexity/sonar.md)
     * [Sonar Pro](api-references/text-models-llm/perplexity/sonar-pro.md)