Docs: Use current spelling for macOS (#26181)

contribute/developer-guide.md

@@ -184,7 +184,7 @@ Are you having issues with setting up your environment? Here are some tips that
 
 ### Too many open files when running `make run`
 
-Depending on your environment, you may have to increase the maximum number of open files allowed. For the rest of this section, we will assume you are on a Unix like OS (e.g. Linux/MacOS), where you can control the maximum number of open files through the [ulimit](https://ss64.com/bash/ulimit.html) shell command.
+Depending on your environment, you may have to increase the maximum number of open files allowed. For the rest of this section, we will assume you are on a Unix like OS (e.g. Linux/macOS), where you can control the maximum number of open files through the [ulimit](https://ss64.com/bash/ulimit.html) shell command.
 
 To see how many open files are allowed, run:
 

docs/sources/administration/configuration.md

@@ -37,7 +37,7 @@ Refer to [Configure a Grafana Docker image]({{< relref "../installation/configur
 
 `sample.ini` is in the same directory as `defaults.ini` and contains all the settings commented out. Copy `sample.ini` and name it `custom.ini`.
 
-### MacOS
+### macOS
 
 By default, the configuration file is located at `/usr/local/etc/grafana/grafana.ini`. To configure Grafana, add a configuration file named `custom.ini` to the `conf` folder to override any of the settings defined in `conf/defaults.ini`.