[nft PATCH 1/2] doc: nft.8: Two minor synopsis fixups

[Phil Sutter <phil@nwl.cc>]

The curly braces in 'add table' are to be put literally, so need to be
bold. Also, they are optional unless either one (or both) of 'comment'
and 'flags' are specified.

The 'add chain' synopsis contained a stray tick, messing up the
following markup.

Fixes: 7fd67ce121f86 ("doc: fix synopsis of named counter, quota and ct {helper,timeout,expect}")
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 doc/nft.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/nft.txt b/doc/nft.txt
index b08e32fadcd5c..248b29af369ad 100644
--- a/doc/nft.txt
+++ b/doc/nft.txt
@@ -321,7 +321,7 @@ Effectively, this is the nft-equivalent of *iptables-save* and
 TABLES
 ------
 [verse]
-{*add* | *create*} *table* ['family'] 'table' [ {*comment* 'comment' *;*'} *{ flags* 'flags' *; }*]
+{*add* | *create*} *table* ['family'] 'table' [*{* [*comment* 'comment' *;*] [*flags* 'flags' *;*] *}*]
 {*delete* | *destroy* | *list* | *flush*} *table* ['family'] 'table'
 *list tables* ['family']
 *delete table* ['family'] *handle* 'handle'
@@ -376,7 +376,7 @@ add table inet mytable
 CHAINS
 ------
 [verse]
-{*add* | *create*} *chain* ['family'] 'table' 'chain' [*{ type* 'type' *hook* 'hook' [*device* 'device'] *priority* 'priority' *;* [*policy* 'policy' *;*] [*comment* 'comment' *;*'] *}*]
+{*add* | *create*} *chain* ['family'] 'table' 'chain' [*{ type* 'type' *hook* 'hook' [*device* 'device'] *priority* 'priority' *;* [*policy* 'policy' *;*] [*comment* 'comment' *;*] *}*]
 {*delete* | *destroy* | *list* | *flush*} *chain* ['family'] 'table' 'chain'
 *list chains* ['family']
 *delete chain* ['family'] 'table' *handle* 'handle'
-- 
2.43.0