HCL2: Add more documentation to path-variables (#10245)

* HCL2: Add more documentation to path-variables

Co-authored-by: Wilken Rivera <dev@wilkenrivera.com>

website/pages/docs/from-1.5/path-variables.mdx

@@ -12,3 +12,30 @@ description: |-
 - `path.cwd`: the directory from where Packer was started.
 
 - `path.root`: the directory of the input HCL file or the input folder.
+
+
+## Examples
+
+```HCL
+locals {
+  settings_file  = "${path.cwd}/settings.txt"
+  scripts_folder = "${path.root}/scripts"
+  root           = path.root
+}
+```
+
+## Related Functions
+
+- [`abspath`](/docs/from-1.5/functions/file/abspath) takes a string containing
+  a filesystem path and converts it to an absolute path.
+
+- [`basename`](/docs/from-1.5/functions/file/basename) returns _only_ the last
+  portion of a filesystem path, discarding the portion that would be returned
+  by `dirname`.
+
+- [`fileset`](/docs/from-1.5/functions/file/fileset) enumerates a set of
+  regular file names given a path and pattern.
+
+- [`dirname`](/docs/from-1.5/functions/file/dirname) returns all of the
+  segments of a filesystem path _except_ the last, discarding the portion that
+  would be returned by `basename`.