fix style errors in fs.relative_to implementation

In commit f52bcaa27fc125ab9ae583af466ba99c164169f3 a few issues were
added:
- doc typo
- imports for utils.universal are not intended to be directly used, it's
  an internal wrapper that exists solely to make mesonlib work well as
  it always did while simultaneously allowing `meson --internal`
  codepaths to avoid importing anything other than an extremely stripped
  down core
- type annotation specific import was imported at runtime scope

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/markdown/Fs-module.md b/docs/markdown/Fs-module.md
index bf9ddba..f136bb9 100644
--- a/docs/markdown/Fs-module.md
+++ b/docs/markdown/Fs-module.md
@@ -228,7 +228,7 @@ fs.stem('foo/bar/baz.dll.a')  # baz.dll
 
 *Since 1.3.0*
 
-Return a relative filepath. In event a relative path could not be found, the
+Return a relative filepath. In the event a relative path could not be found, the
 absolute path of `to` is returned. Relative path arguments will be assumed to be
 relative to `meson.current_source_dir()`.