docs: move template keywords list to corresponding types

I'm going to introduce the "self" variable, and it will make more sense to
document keywords as methods of the self object type.

docs/templates.md

@@ -13,44 +13,13 @@ a follow-up section.
 
 ### Commit keywords
 
-The following keywords can be used in `jj log`/`jj obslog` templates.
-
-* `description: String`
-* `change_id: ChangeId`
-* `commit_id: CommitId`
-* `parents: List<Commit>`
-* `author: Signature`
-* `committer: Signature`
-* `working_copies: String`: For multi-workspace repository, indicate
-  working-copy commit as `<workspace name>@`.
-* `current_working_copy: Boolean`: True for the working-copy commit of the
-  current workspace.
-* `branches: List<RefName>`: Local and remote branches pointing to the commit.
-  A tracking remote branch will be included only if its target is different
-  from the local one.
-* `local_branches: List<RefName>`: All local branches pointing to the commit.
-* `remote_branches: List<RefName>`: All remote branches pointing to the commit.
-* `tags: List<RefName>`
-* `git_refs: List<RefName>`
-* `git_head: List<RefName>`
-* `divergent: Boolean`: True if the commit's change id corresponds to multiple
-  visible commits.
-* `hidden: Boolean`: True if the commit is not visible (a.k.a. abandoned).
-* `conflict: Boolean`: True if the commit contains merge conflicts.
-* `empty: Boolean`: True if the commit modifies no files.
-* `root: Boolean`: True if the commit is the root commit.
+In `jj log`/`jj obslog` templates, all 0-argument methods of [the `Commit`
+type](#commit-type) are available as keywords.
 
 ### Operation keywords
 
-The following keywords can be used in `jj op log` templates.
-
-* `current_operation: Boolean`
-* `description: String`
-* `id: OperationId`
-* `tags: String`
-* `time: TimestampRange`
-* `user: String`
-* `root: Boolean`: True if the commit is the root commit.
+In `jj op log` templates, all 0-argument methods of [the `Operation`
+type](#operation-type) are available as keywords.
 
 ## Operators
 
@@ -90,8 +59,32 @@ No methods are defined. Can be constructed with `false` or `true` literal.
 
 ### Commit type
 
-This type cannot be printed. All commit keywords are accessible as 0-argument
-methods.
+This type cannot be printed. The following methods are defined.
+
+* `description() -> String`
+* `change_id() -> ChangeId`
+* `commit_id() -> CommitId`
+* `parents() -> List<Commit>`
+* `author() -> Signature`
+* `committer() -> Signature`
+* `working_copies() -> String`: For multi-workspace repository, indicate
+  working-copy commit as `<workspace name>@`.
+* `current_working_copy() -> Boolean`: True for the working-copy commit of the
+  current workspace.
+* `branches() -> List<RefName>`: Local and remote branches pointing to the commit.
+  A tracking remote branch will be included only if its target is different
+  from the local one.
+* `local_branches() -> List<RefName>`: All local branches pointing to the commit.
+* `remote_branches() -> List<RefName>`: All remote branches pointing to the commit.
+* `tags() -> List<RefName>`
+* `git_refs() -> List<RefName>`
+* `git_head() -> List<RefName>`
+* `divergent() -> Boolean`: True if the commit's change id corresponds to multiple
+  visible commits.
+* `hidden() -> Boolean`: True if the commit is not visible (a.k.a. abandoned).
+* `conflict() -> Boolean`: True if the commit contains merge conflicts.
+* `empty() -> Boolean`: True if the commit modifies no files.
+* `root() -> Boolean`: True if the commit is the root commit.
 
 ### CommitId / ChangeId type
 
@@ -122,8 +115,15 @@ The following methods are defined. See also the `List` type.
 
 ### Operation type
 
-This type cannot be printed. All operation keywords are accessible as 0-argument
-methods.
+This type cannot be printed. The following methods are defined.
+
+* `current_operation() -> Boolean`
+* `description() -> String`
+* `id() -> OperationId`
+* `tags() -> String`
+* `time() -> TimestampRange`
+* `user() -> String`
+* `root() -> Boolean`: True if the commit is the root commit.
 
 ### OperationId type