Merge pull request #11009 from ZzZombo/patch-1

Fix spelling in `customize-by-directory.md`

Author: v-regandowner

docs/msbuild/customize-by-directory.md

@@ -126,7 +126,7 @@ A summary of MSBuild's general approach is as follows:
 - For any given project, MSBuild finds the first *Directory.Build.props* upward in the solution structure, merges it with defaults, and stops scanning for more.
 - If you want multiple levels to be found and merged, then [`<Import...>`](../msbuild/property-functions.md#msbuild-getpathoffileabove) (shown previously) the "outer" file from the "inner" file.
 - If the "outer" file doesn't itself also import something above it, then scanning stops there.
-- Only do this if the uupper level file actual exists
+- Only do this if the outer file actually exists
 
 Or more simply: the first *Directory.Build.props* that doesn't import anything is where MSBuild stops.