fix nitems_per_file typo in file pattern docs
MODIFY
docs/recipe_user_guide/file_patterns.md
docs/recipe_user_guide/file_patterns.md
@@ -113,7 +113,7 @@ and type of combine dimensions they support.
``ConcatDim`` and allows at most one ``MergeDim``.
-### Specifying `nitems_per_input` in a `ConcatDim`
+### Specifying `nitems_per_file` in a `ConcatDim`
FilePatterns are deliberately very simple. However, there is one case where
we can annotate the FilePattern with a bit of extra information.
@@ -127,7 +127,7 @@ have one record of daily temperature? Ten?
In general, Pangeo Forge does not assume there is a constant, known number of
records in each file; instead it will discover this information by peeking into each file.
But _if we know a-priori that there is a fixed number of records per file_, we can
-provide this as a hint, via `niterms_per_file` keyword in `ConcatDim`.
+provide this as a hint, via `nitems_per_file` keyword in `ConcatDim`.
Providing this hint will allow Pangeo Forge to work more quickly because it
doesn't have to peek into the files.

fix nitems_per_file typo in file pattern docs