treewide: Mark Nix blocks in markdown as Nix

This should help us with highlighting and future formatting.

3 files changed, 11 insertions, 11 deletions

diff --git a/nixos/modules/services/databases/foundationdb.md b/nixos/modules/services/databases/foundationdb.md
index 0815c139152f3..af17c9f959994 100644
--- a/nixos/modules/services/databases/foundationdb.md
+++ b/nixos/modules/services/databases/foundationdb.md
@@ -15,7 +15,7 @@ key-value store.
 
 To enable FoundationDB, add the following to your
 {file}`configuration.nix`:
-```
+```nix
 services.foundationdb.enable = true;
 services.foundationdb.package = pkgs.foundationdb71; # FoundationDB 7.1.x
 ```
@@ -109,7 +109,7 @@ default configuration. See below for more on scaling to increase this.
 FoundationDB stores all data for all server processes under
 {file}`/var/lib/foundationdb`. You can override this using
 {option}`services.foundationdb.dataDir`, e.g.
-```
+```nix
 services.foundationdb.dataDir = "/data/fdb";
 ```
 
@@ -265,7 +265,7 @@ directories.
 For example, to create backups in {command}`/opt/fdb-backups`, first
 set up the paths in the module options:
 
-```
+```nix
 services.foundationdb.extraReadWritePaths = [ "/opt/fdb-backups" ];
 ```
 
diff --git a/nixos/modules/services/databases/postgresql.md b/nixos/modules/services/databases/postgresql.md
index 3ff1f00fa9cfb..ce1f2856b0197 100644
--- a/nixos/modules/services/databases/postgresql.md
+++ b/nixos/modules/services/databases/postgresql.md
@@ -15,7 +15,7 @@ PostgreSQL is an advanced, free relational database.
 ## Configuring {#module-services-postgres-configuring}
 
 To enable PostgreSQL, add the following to your {file}`configuration.nix`:
-```
+```nix
 services.postgresql.enable = true;
 services.postgresql.package = pkgs.postgresql_15;
 ```
@@ -35,7 +35,7 @@ alice=>
 -->
 
 By default, PostgreSQL stores its databases in {file}`/var/lib/postgresql/$psqlSchema`. You can override this using [](#opt-services.postgresql.dataDir), e.g.
-```
+```nix
 services.postgresql.dataDir = "/data/postgresql";
 ```
 
@@ -174,7 +174,7 @@ $ nix-instantiate --eval -A postgresql_13.psqlSchema
 "13"
 ```
 For an upgrade, a script like this can be used to simplify the process:
-```
+```nix
 { config, pkgs, ... }:
 {
   environment.systemPackages = [
@@ -256,7 +256,7 @@ postgresql_15.pkgs.pg_partman        postgresql_15.pkgs.pgroonga
 ```
 
 To add plugins via NixOS configuration, set `services.postgresql.extraPlugins`:
-```
+```nix
 services.postgresql.package = pkgs.postgresql_12;
 services.postgresql.extraPlugins = ps: with ps; [
   pg_repack
@@ -265,7 +265,7 @@ services.postgresql.extraPlugins = ps: with ps; [
 ```
 
 You can build custom PostgreSQL-with-plugins (to be used outside of NixOS) using function `.withPackages`. For example, creating a custom PostgreSQL package in an overlay can look like:
-```
+```nix
 self: super: {
   postgresql_custom = self.postgresql_12.withPackages (ps: [
     ps.pg_repack
@@ -275,7 +275,7 @@ self: super: {
 ```
 
 Here's a recipe on how to override a particular plugin through an overlay:
-```
+```nix
 self: super: {
   postgresql_15 = super.postgresql_15// {
     pkgs = super.postgresql_15.pkgs // {
diff --git a/nixos/modules/services/databases/tigerbeetle.md b/nixos/modules/services/databases/tigerbeetle.md
index 47394d4430598..ed05c982350de 100644
--- a/nixos/modules/services/databases/tigerbeetle.md
+++ b/nixos/modules/services/databases/tigerbeetle.md
@@ -7,7 +7,7 @@
 TigerBeetle is a distributed financial accounting database designed for mission critical safety and performance.
 
 To enable TigerBeetle, add the following to your {file}`configuration.nix`:
-```
+```nix
   services.tigerbeetle.enable = true;
 ```
 
@@ -20,7 +20,7 @@ By default, TigerBeetle will only listen on a local interface.
 To configure it to listen on a different interface (and to configure it to connect to other replicas, if you're creating more than one), you'll have to set the `addresses` option.
 Note that the TigerBeetle module won't open any firewall ports automatically, so if you configure it to listen on an external interface, you'll need to ensure that connections can reach it:
 
-```
+```nix
   services.tigerbeetle = {
     enable = true;
     addresses = [ "0.0.0.0:3001" ];