Fix a non-existent word

Signed-off-by: Thomas Ackermann <[email protected]>

Author: tacker66

book/C-git-commands/1-git-commands.asc

@@ -259,7 +259,7 @@ We set up highly custom refspecs in order to make `git fetch` do something a lit
 
 The `git pull` command is basically a combination of the `git fetch` and `git merge` commands, where Git will fetch from the remote you specify and then immediately try to merge it into the branch you're on.
 
-We introduce it quicking in <<_fetching_and_pulling>> and show how to see what it will merge if you run it in <<_inspecting_remote>>.
+We introduce it quickly in <<_fetching_and_pulling>> and show how to see what it will merge if you run it in <<_inspecting_remote>>.
 
 We also see how to use it to help with rebasing difficulties in <<_rebase_rebase>>.