fix(config_help): use --pattern for section jump; correct ov nav keys

--jump-target does not work reliably on piped stdin. Replace with
--pattern which positions ov at the first occurrence of the keyword
(works like less +/pattern) and keeps the match highlighted so the
user can press n/N to navigate further occurrences.

Also correct the section navigation keys in the offline manual:
  Space = next section  (not '.')
  ^     = previous section  (not ',')
  Alt+u = section list sidebar

docs/fish-config.md

@@ -1216,7 +1216,16 @@ calls fisher update as its first step.
     config_help
 
 ov renders the Markdown with syntax highlighting and section-based
-navigation. Use , and . to jump between sections. Press / to search.
+navigation.
+
+    Space       next section
+    ^           previous section
+    Alt+u       toggle section list sidebar
+    /           search forward
+    n / N       next / previous search match
+    g           go to line number
+    j           interactive jump target (line, %, or 'section')
+    q           quit
 
 ## With bat