fix: extended the patch tool prompt to not strictly forbid placeholde…

…rs, mention scoping strategies and fallback to save

gptme/tools/patch.py

@@ -3,6 +3,7 @@
 """
 
 # TODO: support multiple patches in one codeblock (or make it clear that only one patch per codeblock is supported/applied)
+
 import re
 from collections.abc import Generator
 from pathlib import Path
@@ -16,7 +17,10 @@
 
 This can be used to make changes to files, without having to rewrite the whole file.
 Only one patch block can be written per codeblock. Extra ORIGINAL/UPDATED blocks will be ignored.
-Try to keep the patch as small as possible. Do not use placeholders, as they will make the patch fail.
+Try to keep the patch as small as possible. Avoid placeholders, as they may make the patch fail.
+
+To keep the patch small, try to scope the patch to imports/function/class.
+If the patch is large, consider using the save tool to rewrite the whole file.
 """
 
 ORIGINAL = "<<<<<<< ORIGINAL\n"