coreutils*: use short more info links (#5658)

pages/linux/csplit.md

@@ -2,7 +2,7 @@
 
 > Split a file into pieces.
 > This generates files named "xx00", "xx01", and so on.
-> More information: <https://www.gnu.org/software/coreutils/manual/html_node/csplit-invocation.html>.
+> More information: <https://www.gnu.org/software/coreutils/csplit>.
 
 - Split a file at lines 5 and 23:
 

pages/linux/mknod.md

@@ -1,7 +1,7 @@
 # mknod
 
 > Create block or character device special files.
-> More information: <https://www.gnu.org/software/coreutils/manual/html_node/mknod-invocation.html>.
+> More information: <https://www.gnu.org/software/coreutils/mknod>.
 
 - Create a block device:
 

pages/linux/ptx.md

@@ -1,7 +1,7 @@
 # ptx
 
 > Generate a permuted index of words from one or more text files.
-> More information: <https://www.gnu.org/software/coreutils/manual/html_node/ptx-invocation.html>.
+> More information: <https://www.gnu.org/software/coreutils/ptx>.
 
 - Generate a permuted index where the first field of each line is an index reference:
 

pages/linux/runcon.md

@@ -2,7 +2,7 @@
 
 > Run a program in a different SELinux security context.
 > With neither context nor command, print the current security context.
-> More information: <https://www.gnu.org/software/coreutils/manual/html_node/runcon-invocation.html>.
+> More information: <https://www.gnu.org/software/coreutils/runcon>.
 
 - Determine the current domain: