Docs: Improve offline installer documentation

Docs/Configuration.tex

@@ -4374,7 +4374,8 @@ you will need \texttt{debug=0x8} boot argument.
 
   For offline installation refer to
   \href{https://support.apple.com/HT201372}{How to create a bootable installer for macOS}
-  article.
+  article. Apart from App Store and \texttt{softwareupdate} utility there also are
+  \href{https://github.com/corpnewt/gibMacOS}{third-party tools} to download an offline image.
 
 \item
   \textbf{Why do online recovery images (\texttt{*.dmg}) fail to load?}

Docs/Differences/Differences.tex

 \documentclass[]{article}
 %DIF LATEXDIFF DIFFERENCE FILE
 %DIF DEL PreviousConfiguration.tex   Fri Jan 17 12:56:17 2020
-%DIF ADD ../Configuration.tex        Sat Feb  1 15:29:18 2020
+%DIF ADD ../Configuration.tex        Sat Feb  1 15:39:25 2020
 
 \usepackage{lmodern}
 \usepackage{amssymb,amsmath}
@@ -3921,14 +3921,14 @@ build -a X64 -b RELEASE -t XCODE5 -p MdeModulePkg/MdeModulePkg.dsc
   \textbf{Type}: \texttt{plist\ boolean}\\
   \textbf{Failsafe}: \texttt{false}\\
   \textbf{Description}: Reinstalls Apple Boot Policy protocol with a builtin
-  version. This may be used to ensure APFS compatibility on VMs or legacy Macs\DIFaddbegin \DIFadd{.
-}
+  version. This may be used to ensure APFS compatibility on VMs or legacy Macs.
 
-  \emph{\DIFadd{Note}}\DIFadd{: Some Macs like MacPro5,1 do have APFS compatibility, but their
+  \DIFaddbegin \emph{\DIFadd{Note}}\DIFadd{: Some Macs like MacPro5,1 do have APFS compatibility, but their
   Apple Boot Policy protocol contains recovery detection issues, thus using
-  this option is advised on them as well}\DIFaddend . 
+  this option is advised on them as well. 
+}
 
-\item
+\DIFaddend \item
   \texttt{AppleEvent}\\
   \textbf{Type}: \texttt{plist\ boolean}\\
   \textbf{Failsafe}: \texttt{false}\\
@@ -4445,7 +4445,8 @@ you will need \texttt{debug=0x8} boot argument.
 
   For offline installation refer to
   \href{https://support.apple.com/HT201372}{How to create a bootable installer for macOS}
-  article.
+  article\DIFaddbegin \DIFadd{. Apart from App Store and }\texttt{\DIFadd{softwareupdate}} \DIFadd{utility there also are
+  }\href{https://github.com/corpnewt/gibMacOS}{third-party tools} \DIFadd{to download an offline image}\DIFaddend .
 
 \item
   \textbf{Why do online recovery images (\texttt{*.dmg}) fail to load?}