Apply suggestions from code review

Co-authored-by: Sylvie <[email protected]>

CONTRIBUTING.md

@@ -81,7 +81,7 @@ Feel free to modify how the test scripts work, if the thing you want to test doe
 Each `.asm` file corresponds to one test.
 RGBASM will be invoked on the `.asm` file with all warnings enabled.
 
-If a `.out` file exists, RGBASM's output (`println` etc.) must match its contents.
+If a `.out` file exists, RGBASM's output (`print`, `println`, etc.) must match its contents.
 If a `.err` file exists, RGBASM's error output (`warn`, errors, etc.) must match its contents.
 
 If a `.out.bin` file exists, the object file will be linked, and the generated ROM truncated to the length of the `.out.bin` file.
@@ -95,7 +95,8 @@ All tests begin by assembling the `.asm` file into an object file, which will be
 
 #### Simple tests
 
-These simply check that RGBLINK's output matches... *something*.
+These simply check that RGBLINK's output matches some expected output.
+
 A `.out` file **must** exist, and RGBLINK's output must match that file's contents.
 
 Additionally, if a `.out.bin` file exists, the `.gb` file generated by RGBLINK must match it.
@@ -137,10 +138,10 @@ If one *does* exist, RGBGFX's return status is ignored, but its output **must**
 
 ### Downstream projects
 
-1. Make sure the downstream project supports <code>make <var>&lt;target&gt;</var> RGBDS=<var>&lt;path to RGBDS&gt;</var></code>.
-   While the test suite supports any Make target name, only [Make](//gnu.org/software/make) is currently supported, and the Makefile must support a `RGBDS` variable to use a non-system RGBDS.
+1. Make sure the downstream project supports <code>make <var>&lt;target&gt;</var> RGBDS=<var>&lt;path/to/RGBDS/&gt;</var></code>.
+   While the test suite supports any Make target name, only [Make](//gnu.org/software/make) is currently supported, and the Makefile must support a `RGBDS` variable to use a non-system RGBDS directory.
 
-   Only projects hosted on GitHub are currently supported, too.
+   Also, only projects hosted on GitHub are currently supported.
 2. Add the project to `test/fetch-test-deps.sh`: add a new `action` line at the bottom, following the existing pattern:
 
    ```sh
@@ -151,5 +152,5 @@ If one *does* exist, RGBGFX's return status is ignored, but its output **must**
 3. Add the project to `test/run-tests.sh`: add a new `test_downstream` line at the bottom, following the existing pattern:
 
    ```sh
-   test_downstream <repo>  <makefile target>
+   test_downstream  <repo>  <makefile target>
    ```