Fix typo in the manual page for "jcmd" (man jcmd)

The manual page for "jcmd" (man jcmd) mentions 'path-to-gc-root' instead of 'path-to-gc-roots', so markdown sources should be fixed and the jcmd.1 nroff file should be regenerated.

--- a/src/jdk.jcmd/share/man/jcmd.1
+++ b/src/jdk.jcmd/share/man/jcmd.1
@@ -472,7 +472,7 @@
 If no name is given, data from all recordings is dumped.
 (STRING, no default value)
 .IP \[bu] 2
-\f[V]path-to-gc-root\f[R]: (Optional) Flag for saving the path to
+\f[V]path-to-gc-roots\f[R]: (Optional) Flag for saving the path to
 garbage collection (GC) roots at the time the recording data is dumped.
 The path information is useful for finding memory leaks but collecting
 it can cause the application to pause for a short period of time.
@@ -550,7 +550,7 @@
 command so that you can use it with other commands.
 (STRING, system-generated default name)
 .IP \[bu] 2
-\f[V]path-to-gc-root\f[R]: (Optional) Flag for saving the path to
+\f[V]path-to-gc-roots\f[R]: (Optional) Flag for saving the path to
 garbage collection (GC) roots at the end of a recording.
 The path information is useful for finding memory leaks but collecting
 it is time consuming.