Honestly there isn't anything that you couldn't get by simply reading and applying the advice from "The Elements of Style" by Strunk and White[1] and "On Writing Well" by Zinsser [2].
The primary philosophy is that if you can't write well, then you haven't thought it through. The act of writing is an act of reasoning.
0. Practice in a strong feedback loop. This applies for anything, not just writing.
1. Ruthlessly reduce your sentences. Repeat until you can't eliminate or combine any more words.
2. Avoid adverbs. Use "dashed" or "sprinted" instead of "ran quickly". Learn more words.
3. Avoid weasel words like "should" "could" "might". Take a stance and give concrete reasons.
4. Use concrete data over descriptors. "+5% profit" over "increased profit".
5. Write in active voice. Look up the "by Zombies" trick.
6. Use the simplest word that maintains your meaning. No one needs to use the word "utilize".
[1]: https://www.amazon.com/Elements-Style-Fourth-William-Strunk/...
[2]: https://www.amazon.com/Writing-Well-Classic-Guide-Nonfiction...
1) On Writing Well - William Zinser https://www.amazon.com/Writing-Well-30th-Anniversary-Nonfict...
2) On Writing - Stephen King- https://www.amazon.com/Writing-10th-Anniversary-Memoir-Craft...
3) The Elements of Style - Strunk & White - https://www.amazon.com/Elements-Style-Fourth-William-Strunk/...
The two most important points are concise style and active voice. Both of these habits are critical for SEs to write concise emails, specs and commit messages. You will even see improvement in more casual day to day interactions (via slack, SMS etc).
I've given away more copies of that book than any other. Improves all relationships.
"Elements of Style" aka Strunk and White. https://www.amazon.com/Elements-Style-Fourth-William-Strunk/...
I'd prefer they not only read Elements of Style, but work on it.
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https://www.amazon.com/Elements-Style-Fourth-William-Strunk/...
http://www.amazon.com/Elements-Style-Fourth-William-Strunk/d...
There are many examples about how to write clearly.
A good companion piece. Really, if you want to know how to write, and barely have time to make breakfast, The Elements of Style is the book for you.
Amazon link: http://www.amazon.com/Elements-Style-Fourth-William-Strunk/d...
1999 edition on Amazon: http://www.amazon.com/Elements-Style-Fourth-William-Strunk/d...
1918 edition online: http://www.bartleby.com/141/
For more hand-holding, On Writing Well by William Zinsser is worthwhile.
Amazon: http://www.amazon.com/Writing-Well-30th-Anniversary-Nonficti...
[1] https://www.amazon.com/Elements-Style-Fourth-William-Strunk/...