Docs: Fix invalid autorefs

docs/source/getting_started/installation.rst

@@ -109,15 +109,15 @@ Installing all prerequisites for macOS 11 (with Homebrew):
 Running the build system
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
-From the root `yosys` directory, call the following commands:
+From the root ``yosys`` directory, call the following commands:
 
 .. code:: console
    
    make
    sudo make install
 
 This will build and then install Yosys, making it available on the command line
-as `yosys`.  Note that this also downloads, builds, and installs `ABC`_ (using
+as ``yosys``.  Note that this also downloads, builds, and installs `ABC`_ (using
 :program:`yosys-abc` as the executable name).
 
 .. _ABC: https://github.com/berkeley-abc/abc

docs/source/using_yosys/synthesis/techmap_synth.rst

@@ -29,8 +29,8 @@ provided implementation.
 
 When no map file is provided, techmap uses a built-in map file that maps the
 Yosys RTL cell types to the internal gate library used by Yosys. The curious
-reader may find this map file as `techlibs/common/techmap.v` in the Yosys source
-tree.
+reader may find this map file as :file:`techlibs/common/techmap.v` in the Yosys
+source tree.
 
 Additional features have been added to techmap to allow for conditional mapping
 of cells (see :doc:`/cmd/techmap`). This can for example be useful if the target

docs/source/yosys_internals/extending_yosys/extensions.rst

@@ -11,9 +11,9 @@ Writing extensions
 This chapter contains some bits and pieces of information about programming
 yosys extensions. Don't be afraid to ask questions on the YosysHQ Slack.
 
-The `guidelines/` directory of the Yosys source code contains notes on various
-aspects of Yosys development. In particular, the files GettingStarted and
-CodingStyle may be of interest.
+The :file:`guidelines/` directory of the Yosys source code contains notes on
+various aspects of Yosys development. In particular, the files GettingStarted
+and CodingStyle may be of interest.
 
 .. todo:: what's in guidelines/GettingStarted that's missing from the manual?