JB tools: improve docstrings related to relative_path for external dependencies

Claude was confused..

CHANGELOG.md

@@ -15,6 +15,7 @@ Status of the `main` branch. Changes prior to the next official version change w
 
 * JetBrains:
   - `JetBrainsRenameTool` can now also rename occurrences in comments and text.
+  - Minor fixes in handling `relative_path` for external dependencies.
 
 * Language Servers:
   - Fix Dart LSP returning only symbol name as body instead of full method body.

src/serena/tools/jetbrains_tools.py

@@ -58,6 +58,8 @@ class JetBrainsFindSymbolTool(Tool, ToolMarkerSymbolicRead, ToolMarkerOptional):
             for the case where the symbol is a class, this will return its methods).
             Ignored if `include_body=True`. Default 0.
         :param relative_path: Optional. Restrict search to this file or directory. If not specified, searches entire codebase.
+            Note: for external dependencies, this must be an identifier starting with `<ext` that you have received
+            earlier (don't try to guess!).
         :param include_body: If True, include the symbol's source code. Use judiciously.
         :param include_info: whether to include additional info (hover-like, typically including docstring and signature),
             about the symbol.

src/serena/tools/symbol_tools.py

@@ -258,7 +258,8 @@ class FindReferencingSymbolsTool(Tool, ToolMarkerSymbolicRead):
 
         :param name_path: for finding the symbol to find references for, same logic as in the `find_symbol` tool.
         :param relative_path: the relative path to the file containing the symbol for which to find references.
-            Note that here you can't pass a directory but must pass a file.
+            Note: for external dependencies, this must be an identifier starting with `<ext` that you have received
+            earlier (don't try to guess!).
         :param include_kinds: same as in the `find_symbol` tool.
         :param exclude_kinds: same as in the `find_symbol` tool.
         :param max_answer_chars: same as in the `find_symbol` tool.