Propose fix a couple of typos (ggml-org#21581)

Signed-off-by: John E <jeis4wpi@outlook.com>

Author: jeis4wpi

tests/test-chat.cpp

@@ -3454,7 +3454,7 @@ static void test_template_output_peg_parsers(bool detailed_debug) {
                             },
                             "replaceAll": {
                                 "type": "boolean",
-                                "description": "Whether to replace all occurences."
+                                "description": "Whether to replace all occurrences."
                             }
                         },
                         "required": ["oldString", "newString"]

tools/server/tests/unit/test_completion.py

@@ -135,7 +135,7 @@ def test_completion_stream_with_openai_library_stops():
     client = OpenAI(api_key="dummy", base_url=f"http://{server.server_host}:{server.server_port}/v1")
     res = client.completions.create(
         model="davinci-002",
-        prompt="System: You are helpfull assistant.\nAssistant:\nHey! How could I help?\nUser:\nTell me a joke.\nAssistant:\n",
+        prompt="System: You are helpful assistant.\nAssistant:\nHey! How could I help?\nUser:\nTell me a joke.\nAssistant:\n",
         stop=["User:\n", "Assistant:\n"],
         max_tokens=200,
         stream=True,