docs: document man fish-config and fish_config naming distinction

Adds man page viewing instructions to README Offline Documentation
section and to docs/fish-config.md section 9, including a note that
fish-config (hyphen) is this config's man page while fish_config
(underscore) is fish's built-in browser tool.

README.md

@@ -321,6 +321,16 @@ The viewer falls back through: **ov** (syntax highlight + section navigation)
 
 Examples: `config_help keybindings` · `config_help pkg` · `config_help fish-deps` · `config_help abbreviations`
 
+You can also read the documentation as a standard man page:
+
+```fish
+man fish-config
+```
+
+This works once `~/.local/share/man` is on your `MANPATH` (added automatically by `conf.d/tricks.fish`) and `~/.local/share/man/man1/fish-config.1` is symlinked to `docs/fish-config.1`. The man page itself is auto-generated from `docs/fish-config.md` by the CI pipeline on every push to `main`.
+
+> **Note:** `fish-config` (hyphen) is this configuration's man page. `fish_config` (underscore) is fish's built-in browser-based configuration tool — a completely separate command. Don't mix them up.
+
 ### Dependency Management
 
 `fish-deps` is a unified command for checking, installing, and updating all tools this config depends on.

docs/fish-config.md

@@ -1235,6 +1235,16 @@ navigation.
 
     man -l ~/.config/fish/docs/fish-config.1
 
+If ~/.local/share/man is on your MANPATH (set automatically by
+conf.d/tricks.fish) and ~/.local/share/man/man1/fish-config.1 is
+symlinked to docs/fish-config.1, you can also use:
+
+    man fish-config
+
+NOTE: fish-config (hyphen) is this config's man page. fish_config
+(underscore) is fish's built-in browser-based configuration tool —
+a completely separate command. Do not mix them up.
+
 ## Jumping to a section
 
     config_help keybindings