Bug 1807899 - Remove the trailing whitespace and Windows CR on md files r=linter-reviewers,necko-reviewers,marco,jesup

Differential Revision: https://phabricator.services.mozilla.com/D165662

docs/writing-rust-code/basics.md

@@ -18,7 +18,7 @@ for the `xpcom` crate, run these commands:
 cd xpcom/rust/xpcom
 MOZ_TOPOBJDIR=$OBJDIR cargo doc
 cd -
-firefox target/doc/xpcom/index.html 
+firefox target/doc/xpcom/index.html
 ```
 where `$OBJDIR` is the path to the object directory.
 

docs/writing-rust-code/uniffi.md

@@ -55,7 +55,7 @@ Here's how you can create a new set of bindings using UniFFI:
   3. Generate bindings code for your crate
       - Add the path of your UDL (that you made in step 1) in `toolkit/components/uniffi-bindgen-gecko-js/mach_commands.py`
       - Run `./mach uniffi generate`
-          - add your newly generated `Rust{udl-name}.jsm` file to `toolkit/components/uniffi-bindgen-gecko-js/components/moz.build` 
+          - add your newly generated `Rust{udl-name}.jsm` file to `toolkit/components/uniffi-bindgen-gecko-js/components/moz.build`
       - Then simply import your `jsm` module to the file you want to use it in and start using your APIs!
 
         Example from tabs module:

docs/writing-rust-code/update-policy.md

@@ -5,7 +5,7 @@ Rust toolchains used and required to build Firefox.
 
 This allows contributors to know when new features will be usable, and
 downstream packagers to know what toolchain will be required for each Firefox
-release. Both benefit from the predictability of a schedule. 
+release. Both benefit from the predictability of a schedule.
 
 ## Policy