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/misc/tutor.rs

@@ -313,9 +313,9 @@ tutor each
 
 fn each_tutor() -> &'static str {
     r#"
-The `each` command gives us a way of working with each individual row or
-element of a list one at a time. It reads these in from the pipeline and
-runs a block on each element. A block is a group of pipelines.
+The `each` command gives us a way of working with the individual elements
+(sometimes called 'rows') of a list one at a time. It reads these in from
+the pipeline and runs a block on each one. A block is a group of pipelines.
 ```
 echo 1 2 3 | each { |it| $it + 10}
 ```
@@ -375,9 +375,9 @@ second block if the expression is false.
 
 fn shorthand_tutor() -> &'static str {
     r#"
-You can access cells in a table using a shorthand notation sometimes called a
-"column path" or "cell path". These paths allow you to go from a table to
-rows, columns, or cells inside of the table.
+You can access data in a structure via a shorthand notation called a "cell path",
+sometimes called a "column path". These paths allow you to go from a structure to
+rows, columns, or cells inside of the structure.
 
 Shorthand paths are made from rows numbers, column names, or both. You can use
 them on any variable or subexpression.
@@ -392,8 +392,8 @@ the shorthand path to retrieve only the cell data inside the "PWD" column.
 This will retrieve the cell data in the "name" column on the 5th row (note:
 row numbers are zero-based).
 
-Rows and columns don't need to come in any specific order. You can get the
-same value using:
+For tables, rows and columns don't need to come in any specific order. You can
+produce the same value using:
 ```
 (ls).4.name
 ```