Add headings to match docs urls in hydro output

docs/content/page/hydro/data.mdx

@@ -3,3 +3,15 @@ title: Hydrologic Context Data
 banner: true
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+
+<h2><a name="HYDRO_GEOM_POINTS">Hydrologic IGO Point Geometry</a></h2>
+
+<h2><a name="ANTHRO_POINTS">Hydrologic Output Points</a></h2>
+
+<h2><a name="HYDRO_GEOM_LINES">Hydrologic Reach Geometry</a></h2>
+
+<h2><a name="HYDRO_LINES">Hydrologic Output Lines</a></h2>
+
+<h2><a name="HYDRO_GEOM_DGOS">Hydrologic Output DGOs Polygons</a></h2>
+
+<h2><a name="HYDRO_DGOS">Hydrologic Output DGOs</a></h2>