docs: Fix typo in subdir_done() description

docs/yaml/functions/subdir_done.yaml

@@ -5,7 +5,7 @@ description: |
   Stops further interpretation of the Meson script file from the point
   of the invocation. All steps executed up to this point are valid and
   will be executed by Meson. This means that all targets defined before
-  the call of [[subdir_done]] will be build.
+  the call of [[subdir_done]] will be built.
 
   If the current script was called by `subdir` the execution returns to
   the calling directory and continues as if the script had reached the
@@ -20,5 +20,5 @@ example: |
   executable('exe2', 'exe2.cpp')
   ```
 
-  The executable `exe1` will be build, while the executable `exe2` is not
+  The executable `exe1` will be built, while the executable `exe2` is not
-  build.
+  built.