docs: Fix the markdown for the com{1,2} keyword command line documentation

No change in content.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

docs/misc/xen-command-line.markdown

@@ -336,31 +336,33 @@ will be considered a positional parameter.
 The syntax consists of
 com1=(comma-separated positional parameters),(comma separated name-value pairs)
 
-The accepted name keywords for name=value pairs are
- * `baud` - accepts integer baud rate (eg. 115200) or `auto`
- * `bridge`- Similar to bridge-bdf in positional parameters.
-             Used to determine the PCI bridge to access the UART device.
-             Notation is xx:xx.xx <bus>:<device>.<function>
- * `clock-hz`- accepts large integers to setup UART clock frequencies.
-               Do note - these values are multiplied by 16.
- * `data-bits` - integer between 5 and 8
- * `dev` - accepted values are `pci` OR `amt`. If this option
-           is used to specify if the serial device is pci-based. The io_base
-           cannot be specified when `dev=pci` or `dev=amt` is used.
- * `io-base` - accepts integer which specified IO base port for UART registers
- * `irq` - IRQ number to use
- * `parity` - accepted values are same as positional parameters
- * `port` - Used to specify which port the PCI serial device is located on
-            Notation is xx:xx.xx <bus>:<device>.<function>
- * `reg-shift` - register shifts required to set UART registers
- * `reg-width` - register width required to set UART registers
-                 (only accepts 1 and 4)
- * `stop-bits` - only accepts 1 or 2 for the number of stop bits
+The accepted name keywords for name=value pairs are:
+
+* `baud` - accepts integer baud rate (eg. 115200) or `auto`
+* `bridge`- Similar to bridge-bdf in positional parameters.
+            Used to determine the PCI bridge to access the UART device.
+            Notation is xx:xx.x `<bus>:<device>.<function>`
+* `clock-hz`- accepts large integers to setup UART clock frequencies.
+              Do note - these values are multiplied by 16.
+* `data-bits` - integer between 5 and 8
+* `dev` - accepted values are `pci` OR `amt`. If this option
+          is used to specify if the serial device is pci-based. The io_base
+          cannot be specified when `dev=pci` or `dev=amt` is used.
+* `io-base` - accepts integer which specified IO base port for UART registers
+* `irq` - IRQ number to use
+* `parity` - accepted values are same as positional parameters
+* `port` - Used to specify which port the PCI serial device is located on
+           Notation is xx:xx.x `<bus>:<device>.<function>`
+* `reg-shift` - register shifts required to set UART registers
+* `reg-width` - register width required to set UART registers
+                (only accepts 1 and 4)
+* `stop-bits` - only accepts 1 or 2 for the number of stop bits
 
 The following are examples of correct specifications:
-`com1=115200,8n1,0x3f8,4`
-`com1=115200,8n1,0x3f8,4,reg_width=4,reg_shift=2`
-`com1=baud=115200,parity=n,stop_bits=1,io_base=0x3f8,reg_width=4`
+
+    com1=115200,8n1,0x3f8,4
+    com1=115200,8n1,0x3f8,4,reg_width=4,reg_shift=2
+    com1=baud=115200,parity=n,stop_bits=1,io_base=0x3f8,reg_width=4
 
 ### conring\_size
 > `= <size>`