Add trimming whitespace to Qwen2-1.5b-Instruct and Gemma-2-9b-it

Based on https://huggingface.co/docs/transformers/main/chat_templating#trimming-whitespace

Signed-off-by: ThiloteE <[email protected]>

gpt4all-bindings/python/docs/gpt4all_desktop/chat_templates.md

@@ -210,37 +210,37 @@ For standard templates, GPT4All combines the user message, sources, and attachme
 See issue [3282](https://github.com/nomic-ai/gpt4all/issues/3282)
 ```jinja
 {{ bos_token }}
-{% if messages[0]['role'] == 'system' %}
+{%- if messages[0]['role'] == 'system' %}
 	 {{ raise_exception('System role not supported') }}
-{% endif %}
+{%- endif %}
 
-{% for message in messages %}
-	 {% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}
+{%- for message in messages %}
+	 {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}
 		  {{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}
-	 {% endif %}
-	 {% if (message['role'] == 'assistant') %}
-		  {% set role = 'model' %}
-		  {% else %}{% set role = message['role'] %}
-	 {% endif %}
-	 {{ '<start_of_turn>' + role + '\n' + message['content'] | trim + '<end_of_turn>\n' }}
-{% endfor %}
-
-{% if add_generation_prompt %}
-	 {{'<start_of_turn>model\n' }}
-{% endif %}
+	 {%- endif %}
+	 {%- if (message['role'] == 'assistant') %}
+		  {%- set role = 'model' %}
+		  {%- else %}{% set role = message['role'] %}
+	 {%- endif %}
+	 {{- '<start_of_turn>' + role + '\n' + message['content'] | trim + '<end_of_turn>\n' }}
+{%- endfor %}
+
+{%- if add_generation_prompt %}
+	 {{ '<start_of_turn>model\n' }}
+{%- endif %}
 ```
 
 ## Qwen/Qwen2-1.5B-Instruct
 See issue [3263](https://github.com/nomic-ai/gpt4all/issues/3263)
 ```jinja
-{% for message in messages %}
-    {% if loop.first and messages[0]['role'] != 'system' %}
-        {{ '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n' }}
-    {% endif %}
-        {{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n' }}
-{% endfor %}
-
-{% if add_generation_prompt %}
+{%- for message in messages %}
+    {%- if loop.first and messages[0]['role'] != 'system' %}
+        {{  '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n' }}
+    {%- endif %}
+        {{ '<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n' }}
+{%- endfor %}
+
+{%- if add_generation_prompt %}
     {{ '<|im_start|>assistant\n' }}
-{% endif %}
+{%- endif %}
 ```