docs: improve markdown formatting of template, and fix typos (#67)

Co-authored-by: Gabriele Bartoli <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,51 +7,56 @@ assignees: ''
 
 ---
 
-**Describe the bug**
+### Describe the bug
 
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+### To Reproduce
 
 Steps to reproduce the behavior:
+
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
 
-**Expected behavior**
+### Expected behavior
 
 A clear and concise description of what you expected to happen.
 
-**Screenshots**
+### Screenshots
 
 If applicable, add screenshots to help explain your problem.
 
-**Operating system with version**
+### Operating system with version
+
 For example:
+
 - Debian 10
 - Ubuntu 18.04 LTS
 - Fedora Silverblue 31
 - Arch Linux
 - Manjaro
 - Gentoo
 
-**GNOME Shell version**
+### GNOME Shell version
 
 You can see your GNOME shell version from Settings->Details or `gnome-shell --version`.
+
 - 3.38
 - 3.36
 - 3.34
 - 3.32
 
-**Installation method**
-- https://extensions.gnome.org/extension/1202/nasa-apod/
+### Installation method
+
+- <https://extensions.gnome.org/extension/1202/nasa-apod/>
 - git
 - zip file
 - [AUR](https://aur.archlinux.org/packages/gnome-shell-extension-nasa-apod/)
-- disto package
+- distro package
 
-**Logs <- VERY IMPORTANT**
+### Logs <- VERY IMPORTANT
 
 Please paste below the relevant parts of `journalctl -f -o cat /usr/bin/gnome-shell`.
 If you don't use systemd, you have to find where the logs are stored and paste them here.
@@ -60,9 +65,9 @@ If you don't use systemd, you have to find where the logs are stored and paste t
 
 ```
 
-**Extension's settings**
+### Extension's settings
 
-Some errors might be triggered by a spefic set of settings. The command below outputs all of the extension settigs that were changed from the default value.
+Some errors might be triggered by a specific set of settings. The command below outputs all of the extension settings that were changed from the default value.
 
 If you installed the extension system-wide (e.g. from AUR or distro packages) the command is:  
 `gsettings --schemadir /usr/share/gnome-shell/extensions/[email protected]/schemas/schemas/ list-recursively org.gnome.shell.extensions.nasa-apod`.