bump default fzf height to 90% and improve fzf option explanations

conf.d/fzf.fish

@@ -21,10 +21,10 @@ end
 # If FZF_DEFAULT_OPTS is not set, then set some sane defaults. This also affects fzf outside of this plugin.
 # See https://github.com/junegunn/fzf#environment-variables
 if not set --query FZF_DEFAULT_OPTS
-    # cycle makes scrolling easier
-    # reverse layout is more familiar as it mimicks the layout of git log, history, and env
+    # cycle allows jumping between the top and bottom most results, making scrolling easier
+    # reverse layout lists results from top to bottom, which is more familiar as it mimicks the layout of git log, history, and env
     # border makes clear where the fzf window ends
-    # height 75% allows you to view what you were doing and stay in context of your work
-    # preview-window wrap wraps long lines in the preview window
-    set --export FZF_DEFAULT_OPTS '--cycle --layout=reverse --border --height 75% --preview-window=wrap'
+    # height 90% leaves space to see the command line and some terminal scrollback, maintaining context of work
+    # preview-window wrap wraps long lines in the preview window, making reading easier
+    set --export FZF_DEFAULT_OPTS '--cycle --layout=reverse --border --height 90% --preview-window=wrap'
 end