Mention the "c" key (tag subtree) in the man

This was reported by @agguser.

Mention the "c" key (tag subtree) in the man
This was reported by @agguser.
fda1475a · Jérémie Roquet · Hisham Muhammad · ebf3cff1 · fda1475a
Commit fda1475a authored 6 years ago by Jérémie Roquet Committed by Hisham Muhammad 6 years ago
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--- a/htop.1.in
+++ b/htop.1.in
@@ -85,8 +85,13 @@ Tag or untag a process. Commands that can operate on multiple processes,
 like "kill", will then apply over the list of tagged processes, instead
 of the currently highlighted one.
 .TP
+.B c
+Tag the current process and its children. Commands that can operate on multiple
+processes, like "kill", will then apply over the list of tagged processes,
+instead of the currently highlighted one.
+.TP
 .B U
-Untag all processes (remove all tags added with the Space key).
+Untag all processes (remove all tags added with the Space or c keys).
 .TP
 .B s
 Trace process system calls: if strace(1) is installed, pressing this key