Fix typo in help stor import (#12442)

Changed `export` for `import`

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# Description
`help stor import` showed a help string that was probably copy-pasted
from `stor export`
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# User-Facing Changes
Now `help stor import` shows a correct description of the operation that
it is doing
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crates/nu-command/src/stor/import.rs

@@ -15,7 +15,7 @@ impl Command for StorImport {
             .required_named(
                 "file-name",
                 SyntaxShape::String,
-                "file name to export the sqlite in-memory database to",
+                "file name to import the sqlite in-memory database from",
                 Some('f'),
             )
             .allow_variants_without_examples(true)