Update r.li.html reference to fragstat paper

updated dead URL to fragstat paper by McGarigal et al.
OSGeo · Jul 8, 2024 · 906cb45 · 906cb45
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diff --git a/raster/r.li/r.li.html b/raster/r.li/r.li.html
@@ -211,7 +211,7 @@ <h2>REFERENCES</h2>
 McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern
 analysis program for quantifying landscape structure. USDA For. Serv.
 Gen. Tech. Rep. PNW-351
- (<a href="http://www.fs.fed.us/pnw/pubs/gtr_351.pdf">PDF</a>).
+ (<a href="https://research.fs.usda.gov/treesearch/3064">PDF</a>).
 
 <li>
 Baker, W.L. and Y. Cai. 1992. The r.le programs for multiscale analysis of