Corrected sentence about SHA-1 collision

    Fixes: #700

Author: Kaartic Sivaraam

book/07-git-tools/sections/revision-selection.asc

@@ -82,7 +82,8 @@ That’s 1,200 times the number of grains of sand on the earth.
 
 Here’s an example to give you an idea of what it would take to get a SHA-1 collision.
 If all 6.5 billion humans on Earth were programming, and every second, each one was producing code that was the equivalent of the entire Linux kernel history (3.6 million Git objects) and pushing it into one enormous Git repository, it would take roughly 2 years until that repository contained enough objects to have a 50% probability of a single SHA-1 object collision.
-A higher probability exists that every member of your programming team will be attacked and killed by wolves in unrelated incidents on the same night.
+Thus, a SHA-1 collision is less likely than every member of your programming team being attacked and killed by wolves in unrelated incidents on the same night.
+
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