[DOC] Add missing escape

Before:
```
* + corresponds to $+, which contains last capture group.
```

After:
```
* \+ corresponds to $+, which contains last capture group.
```
This commit is contained in:
Kazuhiro NISHIYAMA 2023-03-16 18:37:19 +09:00
parent 90d3bbb52b
commit 5cffa69c1b
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@ -90,7 +90,7 @@
# which contains string after match.
# - <tt>\`</tt> corresponds to <tt>$`</tt>,
# which contains string before match.
# - <tt>\+</tt> corresponds to <tt>$+</tt>,
# - <tt>\\+</tt> corresponds to <tt>$+</tt>,
# which contains last capture group.
#
# See rdoc-ref:regexp.rdoc for details.