(docs): correct how to install gcc on Windows (#2013)

* docs: Correct how to install gcc on Windows

PATH needs to be manually set on Windows. Previously, it was explicitly
mentioned that it was unnecessary. More recent experience is that it's necessary.

* regenerate texi

Co-authored-by: Jethro Kuan <jethrokuan95@gmail.com>

doc/org-roam.org

@@ -288,29 +288,25 @@ in your Emacs environment as a prerequisite for Org-roam when you install it.
 ~emacsql-sqlite~ requires a C compiler (e.g. ~gcc~ or ~clang~) to be present in
 your computer. How to install a C compiler depends on the OS that you use.
 
-- For Windows:
+**** C Compiler for Windows
 
-There are various ways to install one, depending on how you have installed
+One of the easiest ways to install a C compiler in Windows is to use [[https://www.msys2.org/][MSYS2]] as at the time of this writing:
-Emacs. If you use Emacs within a Cygwin or MinGW environment, then you should
-install a compiler using their respective package manager.
 
-If you have installed your Emacs from the [[https://www.gnu.org/software/emacs/][GNU Emacs website]], then the easiest way
+1. Download and use the installer in the official MSYS2 website
-is to use [[https://www.msys2.org/][MSYS2]] as at the time of this writing:
+2. Run MSYS2 and in its terminal, type the following and answer "Y" to
-
+   proceed -- this will install ~gcc~ in your PC:
-1. Use the installer in the official website and install MSYS2
-2. Run MSYS2
-3. In the command-line tool, type the following and answer "Y" to proceed:
 
    #+BEGIN_SRC bash
      pacman -S gcc
    #+END_SRC
 
-   Note that you do not need to manually set the PATH for MSYS2; the
+4. On Windows, add ~C:\msys64\usr\bin~ (command =where gcc= in MSYS2 terminal
-installer automatically takes care of it for you.
+   can tell you the correct path) to ~PATH~ in your environmental variables
 
-4. Open Emacs and call ~M-x org-roam-db-autosync-mode~
+5. Launch Emacs and call ~M-x org-roam-db-autosync-mode~ (launch Emacs after
+   defining the path, so that Emacs can recognize it)
 
-   This will automatically start compiling ~emacsql-sqlite~; you should see a
+This will automatically start compiling ~emacsql-sqlite~; you should see a
 message in minibuffer. It may take a while until compilation completes. Once
 complete, you should see a new file ~emacsql-sqlite.exe~ created in a subfolder
 named ~sqlite~ under ~emacsql-sqlite~ installation folder. It's typically in

doc/org-roam.texi

@@ -100,6 +100,10 @@ Installation Troubleshooting
 
 * C Compiler::
 
+C Compiler
+
+* C Compiler for Windows::
+
 Getting Started
 
 * The Org-roam Node::
@@ -535,42 +539,39 @@ in your Emacs environment as a prerequisite for Org-roam when you install it.
 @code{emacsql-sqlite} requires a C compiler (e.g. @code{gcc} or @code{clang}) to be present in
 your computer. How to install a C compiler depends on the OS that you use.
 
-@itemize
+@menu
-@item
+* C Compiler for Windows::
-For Windows:
+@end menu
-@end itemize
 
-There are various ways to install one, depending on how you have installed
+@node C Compiler for Windows
-Emacs. If you use Emacs within a Cygwin or MinGW environment, then you should
+@unnumberedsubsubsec C Compiler for Windows
-install a compiler using their respective package manager.
 
-If you have installed your Emacs from the @uref{https://www.gnu.org/software/emacs/, GNU Emacs website}, then the easiest way
+One of the easiest ways to install a C compiler in Windows is to use @uref{https://www.msys2.org/, MSYS2} as at the time of this writing:
-is to use @uref{https://www.msys2.org/, MSYS2} as at the time of this writing:
 
 @itemize
 @item
-Use the installer in the official website and install MSYS2
+Download and use the installer in the official MSYS2 website
 
 @item
-Run MSYS2
+Run MSYS2 and in its terminal, type the following and answer ``Y'' to
-
+proceed -- this will install @code{gcc} in your PC:
-@item
-In the command-line tool, type the following and answer ``Y'' to proceed:
 
 @example
 pacman -S gcc
 @end example
 
-Note that you do not need to manually set the PATH for MSYS2; the
-@end itemize
-installer automatically takes care of it for you.
 
-@itemize
 @item
-Open Emacs and call @code{M-x org-roam-db-autosync-mode}
+On Windows, add @code{C:\msys64\usr\bin} (command @samp{where gcc} in MSYS2 terminal
+can tell you the correct path) to @code{PATH} in your environmental variables
+
+
+@item
+Launch Emacs and call @code{M-x org-roam-db-autosync-mode} (launch Emacs after
+defining the path, so that Emacs can recognize it)
+@end itemize
 
 This will automatically start compiling @code{emacsql-sqlite}; you should see a
-@end itemize
 message in minibuffer. It may take a while until compilation completes. Once
 complete, you should see a new file @code{emacsql-sqlite.exe} created in a subfolder
 named @code{sqlite} under @code{emacsql-sqlite} installation folder. It's typically in