add whatsnew for pandas-dev#26002

Author: simonjayhawkins

doc/source/whatsnew/v0.25.0.rst

@@ -348,6 +348,7 @@ I/O
 
 - Bug in :func:`DataFrame.to_html()` where values were truncated using display options instead of outputting the full content (:issue:`17004`)
 - Bug in :meth:`DataFrame.to_html` that would ignore ``formatters`` argument for float values in a column with ``dtype=object`` (:issue:`13021`)
+- Bug in :meth:`DataFrame.to_string` and :meth:`DataFrame.to_latex` that would add a leading space when using ``formatters`` on a column with ``dtype=object`` (:issue:`26002`)
 - Fixed bug in missing text when using :meth:`to_clipboard` if copying utf-16 characters in Python 3 on Windows (:issue:`25040`)
 - Bug in :func:`read_json` for ``orient='table'`` when it tries to infer dtypes by default, which is not applicable as dtypes are already defined in the JSON schema (:issue:`21345`)
 - Bug in :func:`read_json` for ``orient='table'`` and float index, as it infers index dtype by default, which is not applicable because index dtype is already defined in the JSON schema (:issue:`25433`)