Update docs for recent releases

Add Maven/Gradle lockfile formats (maven.graph.json, dependencies.lock),
man pages note, and --version flag.

Author: andrew

content/docs/coverage.md

@@ -32,7 +32,7 @@ git-pkgs supports different ecosystems at different levels depending on the unde
 | Homebrew | Brewfile | Brewfile.lock.json | ✓ | ✓ | brew |
 | Julia | Project.toml | Manifest.toml | ✓ | ✓ | |
 | LuaRocks | *.rockspec | | ✓ | | luarocks |
-| Maven | pom.xml, build.gradle, build.sbt | gradle.lockfile | ✓ | ✓ | maven, gradle, sbt |
+| Maven | pom.xml, build.gradle, build.sbt | gradle.lockfile, maven.graph.json, dependencies.lock | ✓ | ✓ | maven, gradle, sbt |
 | Nimble | *.nimble | | ✓ | | nimble |
 | Nix | flake.nix | flake.lock | | | |
 | npm | package.json | package-lock.json, yarn.lock, pnpm-lock.yaml, bun.lock | ✓ | ✓ | npm, pnpm, yarn, bun |

content/docs/installation.md

@@ -19,6 +19,8 @@ Binaries are available for:
 - Linux (amd64 and arm64)
 - Windows (amd64)
 
+Each release includes man pages in the archive. Copy them to your man path (e.g., `/usr/local/share/man/man1/`) to enable `man git-pkgs`.
+
 ## Build from source
 
 Requires Go 1.22 or later.
@@ -30,7 +32,7 @@ go install github.com/git-pkgs/git-pkgs@latest
 ## Verify installation
 
 ```bash
-git pkgs version
+git pkgs --version
 ```
 
 ## Shell completions