docs: remove branches from git revs

docs/src/content/docs/guides/dependencies.mdx

@@ -38,17 +38,17 @@ Git dependencies are dependencies on packages hosted on a Git repository.
 
 ```toml title="pesde.toml"
 [dependencies]
-acme = { repo = "acme/package", rev = "main" }
+acme = { repo = "acme/package", rev = "aeff6" }
 ```
 
 In this example, we're specifying a dependency on the package contained within
-the `acme/package` GitHub repository at the `main` branch.
+the `acme/package` GitHub repository at the `aeff6` commit.
 
-You can also use a URL to specify the Git repository and a specific commit.
+You can also use a URL to specify the Git repository and a tag for the revision.
 
 ```toml title="pesde.toml"
 [dependencies]
-acme = { repo = "https://git.acme.local/package.git", rev = "aeff6" }
+acme = { repo = "https://git.acme.local/package.git", rev = "v0.1.0" }
 ```
 
 You can also specify a path if the package is not at the root of the repository.

docs/src/content/docs/reference/manifest.mdx

@@ -372,14 +372,14 @@ foo = { wally = "acme/foo", version = "1.2.3", index = "acme" }
 
 ```toml
 [dependencies]
-foo = { repo = "acme/packages", rev = "main", path = "foo" }
+foo = { repo = "acme/packages", rev = "aeff6", path = "foo" }
 ```
 
 **Git dependencies** contain the following fields:
 
 - `repo`: The URL of the Git repository.
   This can either be `<owner>/<name>` for a GitHub repository, or a full URL.
-- `rev`: The Git revision to install. This can be a branch, tag, or commit hash.
+- `rev`: The Git revision to install. This can be a tag or commit hash.
 - `path`: The path within the repository to install. If not specified, the root
   of the repository is used.