docs: exactly match spelling of distro package names

And use the project’s preferred spelling when
not referring to specific distro package.

Spelling of RedHat packages was left as is
as I can’t access RedHat’s package repository.

docs/docs/installation/arch_linux_en.md

@@ -20,7 +20,7 @@ This guide will assume that you have administrative rights, either as root or a
 
 * `nginx` (preferred, example configs for other reverse proxies can be found in the repo)
 * `certbot` (or any other ACME client for Let’s Encrypt certificates)
-* `ImageMagick`
+* `imagemagick`
 * `ffmpeg`
 * `exiftool`
 

docs/docs/installation/optional/media_graphics_packages.md

@@ -1,30 +1,30 @@
 # Optional software packages needed for specific functionality
 
-For specific Akkoma functionality (which is disabled by default) some or all of the below packages are required:
-  * `ImageMagick`
-  * `ffmpeg`
-  * `exiftool`
+For specific Akkoma functionality (which is disabled by default) some or all of the below projects are required:
+  * ImageMagick
+  * ffmpeg
+  * ExifTool
   
 Please refer to documentation in `docs/installation` on how to install them on specific OS.
   
 Note: the packages are not required with the current default settings of Akkoma.
 
-## `ImageMagick`
+## ImageMagick
 
-`ImageMagick` is a set of tools to create, edit, compose, or convert bitmap images.
+ImageMagick provides a set of tools to create, edit, compose, or convert bitmap images.
 
 It is required for the following Akkoma features:
   * `Pleroma.Upload.Filters.Mogrify`, `Pleroma.Upload.Filters.Mogrifun` upload filters (related config: `Pleroma.Upload/filters` in `config/config.exs`)
   * Media preview proxy for still images (related config: `media_preview_proxy/enabled` in `config/config.exs`)
   
-## `ffmpeg`
+## ffmpeg
 
 `ffmpeg` is software to record, convert and stream audio and video.
 
 It is required for the following Akkoma features:
   * Media preview proxy for videos (related config: `media_preview_proxy/enabled` in `config/config.exs`)
 
-## `exiftool`
+## ExifTool
 
 `exiftool` is media files metadata reader/writer.
 

docs/docs/installation/otp_en.md

@@ -58,7 +58,7 @@ Other than things bundled in the OTP release Akkoma depends on:
 Per [`docs/installation/optional/media_graphics_packages.md`](optional/media_graphics_packages.md):
   * ImageMagick
   * ffmpeg
-  * exiftool
+  * ExifTool
 
 === "Alpine"
     ```