MINOR: [Docs] Typo in building.rst (#48768)

### Rationale for this change
A tiny typo in building.rst
### What changes are included in this PR?
`` removed
### Are these changes tested?
No.
### Are there any user-facing changes?
No.

Authored-by: tadeja <tadeja@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

Author: tadeja

docs/source/developers/python/building.rst

@@ -476,7 +476,7 @@ To install an editable PyArrow build, run the following command from the
 
 .. code-block::
 
-   pip install -e . --no-build-isolation``
+   pip install -e . --no-build-isolation
 
 This creates an *editable install*, meaning changes to the Python source code
 will be reflected immediately without needing to reinstall the package.