git: 15f84d81a3 - main - [fdp-primer]: Mention textproc/vale in man pages test section

The branch main has been updated by fernape:

URL: https://cgit.FreeBSD.org/doc/commit/?id=15f84d81a3d7b8c05b5aefc820288329886f3f0a

commit 15f84d81a3d7b8c05b5aefc820288329886f3f0a
Author:     Fernando Apesteguía <fernape@FreeBSD.org>
AuthorDate: 2023-08-28 06:59:57 +0000
Commit:     Fernando Apesteguía <fernape@FreeBSD.org>
CommitDate: 2023-08-29 10:52:23 +0000

    [fdp-primer]: Mention textproc/vale in man pages test section
    
    textproc/vale can be used to check syntax for manual pages.
---
 .../content/en/books/fdp-primer/manual-pages/_index.adoc     | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/documentation/content/en/books/fdp-primer/manual-pages/_index.adoc b/documentation/content/en/books/fdp-primer/manual-pages/_index.adoc
index 206704c902..4b6d9d77c1 100644
--- a/documentation/content/en/books/fdp-primer/manual-pages/_index.adoc
+++ b/documentation/content/en/books/fdp-primer/manual-pages/_index.adoc
@@ -501,6 +501,18 @@ Use package:textproc/igor[] to proofread the manual page:
 % igor ./mynewmanpage.8
 ....
 
+Another useful tool is package:textproc/vale[].
+It does not support the man:mdoc[7] syntax but the rendered manual page can be
+read from standard input:
+
+[source,shell]
+....
+% man ls | vale
+....
+
+package:textproc/vale[] is highly configurable.
+It is advised to read its documentation.
+
 Use man:man[1] to check the final result of your changes:
 
 [source,shell]