Replace all instances of 'column path' in help messages with 'cell path' (#7063)

* Rewrite all 'column path' instances to 'cell path'

* Minor tweak

crates/nu-command/src/strings/format/filesize.rs

@@ -37,7 +37,7 @@ impl Command for FileSize {
             .rest(
                 "rest",
                 SyntaxShape::CellPath,
-                "Optionally find and replace text by column paths",
+                "For a data structure input, format filesizes at the given cell paths",
             )
             .category(Category::Strings)
     }