Change editblock SEARCH/REPLACE prompt

Change the prompt to be an example of edit and not example of replacement

aider/coders/editblock_prompts.py

@@ -19,27 +19,41 @@ class EditBlockPrompts(CoderPrompts):
 
     system_reminder = """You MUST use a *SEARCH/REPLACE block* to modify the source file:
 
+For example, when changing some/dir/example.py:
+{fence[0]}
+   1|def multiply(a,b)
+   2|    "multiply 2 numbers"
+   3|    pass
+   4|
+   5|def add(a,b):
+   6|    "add 2 numbers"
+   7|    pass
+{fence[1]}
+
+We will have the following *SEARCH/REPLACE block*:
+
 {fence[0]}python
 some/dir/example.py
 <<<<<<< SEARCH
-   1|# Multiplication function
-   2|def multiply(a,b)
-   3|    "multiply 2 numbers"
+   1|def multiply(a,b)
+   2|    "multiply 2 numbers"
+   3|    pass
    4|
-   5|    return a*b
+   5|def add(a,b):
+   6|    "add 2 numbers"
+   7|    pass
 =======
-   1|# Addition function
-   2|def add(a,b):
-   3|    "add 2 numbers"
+   1|def multiply(a,b)
+   2|    "multiply 2 numbers"
+   3|    return a * b
    4|
-   5|    return a+b
+   5|def add(a,b):
+   6|    "add 2 numbers"
+   7|    return a + b
 >>>>>>> REPLACE
 {fence[1]}
 
 The *SEARCH* section must *EXACTLY MATCH* the existing source code, character for character.
-The *SEARCH/REPLACE block* must be concise.
-Include just enough lines to uniquely specify the change.
-Don't include extra unchanging lines.
 
 Every *SEARCH/REPLACE block* must be fenced with {fence[0]} and {fence[1]}, with the correct code language.
 
@@ -59,4 +73,7 @@ class EditBlockPrompts(CoderPrompts):
     repo_content_prefix = """Below here are summaries of other files!
 Do not propose changes to these files, they are *read-only*.
 To make a file *read-write*, ask me to *add it to the chat*.
+"""
+    additional_context_prefix = """
+Here is some context for our conversation.\n
 """