Update 03-large-files.md

[sureshpantheor]

Closes #

Summary

Doc Page Title - <Enter a one sentence summation of the pertinent changes (including not-yet-completed work) provided by this PR.>

Effect

The following changes are already committed:

Remaining Work and Prerequisites

The following changes still need to be completed:

• List any outstanding work here

Dependencies and Timing

• Other prerequisites that must be completed before merging this PR

Release:

• When ready
• After date: $DATE

---

Post Launch

Do not remove - To be completed by the docs team upon merge:

• Redirect /old-path/ => /new-path/ (if applicable)
• Include/exclude pages ^ respectively within docs search service provider (if applicable)
• For Heroes - add a props post to the discussion board.
• Remove from the project board

[rachelwhitton]

Note: On merge, add @pantheon-systems/filesystem to the CODEOWNERS file for this content

[djschaap]

Some editing suggestions but looks great overall.

[sureshpantheor]

Doug,
Let's go with the changes you have suggested