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docs: Add an example of how to use .PrevInSection

It's not a common knowledge what the "pointer" is so let's
add an example of how to use .PrevInSection

--- a/docs/content/templates/variables.md

+++ b/docs/content/templates/variables.md

@@ -44,7 +44,7 @@

 **.TableOfContents** The rendered table of contents for this content.<br>

 **.Prev** Pointer to the previous content (based on pub date).<br>

 **.Next** Pointer to the following content (based on pub date).<br>

-**.PrevInSection** Pointer to the previous content within the same section (based on pub date)<br>

+**.PrevInSection** Pointer to the previous content within the same section (based on pub date). For example, `{{if .PrevInSection}}{{.PrevInSection.Permalink}}{{end}}`.<br>

 **.NextInSection** Pointer to the following content within the same section (based on pub date)<br>

 **.FuzzyWordCount** The approximate number of words in the content.<br>

 **.WordCount** The number of words in the content.<br>