docs: fixup to b318b20, mark code blocks as text

This prevents rust doctests from trying to compile the code blocks.

I don't think we use doctests much or at all, but I'd like
`cargo insta test --test-runner nextest --accept --workspace`
to pass.

Unfortunately, this affects the output of `jj help` as well, but I
can't think of a workaround for that.

cli/src/commands/next.rs

@@ -27,24 +27,20 @@ use crate::ui::Ui;
 /// Move the current working copy commit to the next child revision in the
 /// repository.
 ///
-///
 /// The command moves you to the next child in a linear fashion.
 ///
-///
-/// ```
+/// ```text
 /// D      D @
 /// |      |/
 /// C @ => C
 /// |/     |
 /// B      B
 /// ```
 ///
-///
 /// If `--edit` is passed, it will move you directly to the child
 /// revision.
 ///
-///
-/// ```
+/// ```text
 /// D    D
 /// |    |
 /// C    C

cli/src/commands/prev.rs

@@ -25,7 +25,7 @@ use crate::ui::Ui;
 ///
 /// The command moves you to the parent in a linear fashion.
 ///
-/// ```
+/// ```text
 /// D @  D
 /// |/   |
 /// A => A @
@@ -36,7 +36,7 @@ use crate::ui::Ui;
 /// If `--edit` is passed, it will move the working copy commit
 /// directly to the parent.
 ///
-/// ```
+/// ```text
 /// D @  D
 /// |/   |
 /// C => @

cli/src/commands/rebase.rs

@@ -46,7 +46,7 @@ use crate::ui::Ui;
 /// your history like this (letters followed by an apostrophe are post-rebase
 /// versions):
 ///
-/// ```
+/// ```text
 /// O           N'
 /// |           |
 /// | N         M'
@@ -73,7 +73,7 @@ use crate::ui::Ui;
 /// -d O` would transform your history like this (because `L` and `M` are on the
 /// same "branch", relative to the destination):
 ///
-/// ```
+/// ```text
 /// O           N'
 /// |           |
 /// | N         M'
@@ -92,7 +92,7 @@ use crate::ui::Ui;
 /// onto the specified revision's parent(s). For example, `jj rebase -r K -d M`
 /// would transform your history like this:
 ///
-/// ```
+/// ```text
 /// M          K'
 /// |          |
 /// | L        M
@@ -107,7 +107,7 @@ use crate::ui::Ui;
 /// order to work (in addition to its current parent K), you can run `jj rebase
 /// -s L -d K -d M`:
 ///
-/// ```
+/// ```text
 /// M          L'
 /// |          |\
 /// | L        M |

cli/tests/cli-reference@.md.snap

@@ -1133,24 +1133,20 @@ For more information, see https://github.com/martinvonz/jj/blob/main/docs/workin
 Move the current working copy commit to the next child revision in the
 repository.
 
-
 The command moves you to the next child in a linear fashion.
 
-
-```
+```text
 D      D @
 |      |/
 C @ => C
 |/     |
 B      B
 ```
 
-
 If `--edit` is passed, it will move you directly to the child
 revision.
 
-
-```
+```text
 D    D
 |    |
 C    C
@@ -1339,7 +1335,7 @@ Move the working copy commit to the parent of the current revision.
 
 The command moves you to the parent in a linear fashion.
 
-```
+```text
 D @  D
 |/   |
 A => A @
@@ -1350,7 +1346,7 @@ B    B
 If `--edit` is passed, it will move the working copy commit
 directly to the parent.
 
-```
+```text
 D @  D
 |/   |
 C => @
@@ -1391,7 +1387,7 @@ onto the destination. For example, `jj rebase -s M -d O` would transform
 your history like this (letters followed by an apostrophe are post-rebase
 versions):
 
-```
+```text
 O           N'
 |           |
 | N         M'
@@ -1418,7 +1414,7 @@ single root). For example, either `jj rebase -b L -d O` or `jj rebase -b M
 -d O` would transform your history like this (because `L` and `M` are on the
 same "branch", relative to the destination):
 
-```
+```text
 O           N'
 |           |
 | N         M'
@@ -1437,7 +1433,7 @@ destination. Any "hole" left behind will be filled by rebasing descendants
 onto the specified revision's parent(s). For example, `jj rebase -r K -d M`
 would transform your history like this:
 
-```
+```text
 M          K'
 |          |
 | L        M
@@ -1452,7 +1448,7 @@ For example, if you realize that commit L actually depends on commit M in
 order to work (in addition to its current parent K), you can run `jj rebase
 -s L -d K -d M`:
 
-```
+```text
 M          L'
 |          |\
 | L        M |