Use spaces for indentation

Author: T0mstone

CONTRIBUTING.md

@@ -47,34 +47,34 @@ adhere to them if possible.
 - Symbol names are lowercase unless the symbol is an uppercase letter.
 - Symbol names should be at least two characters long so they can be used easily in Typst's math mode.
 - When a symbol is added to a base, the symbol name is used as a modifier on the base.[^modifname]
-	This can have the following meanings:
-	1. The symbol is added around or inside the base as a subordinate (smaller than the base),
-		e.g. `eq.quest`, `triangle.stroked.dot`.
-	2. The symbol is stacked below the base, e.g. `gt.lt`.
-	3. The symbol is stacked to the right of the base, e.g. `colon.eq`.
-	4. The symbol is overlaid at the center of the base, e.g. `integral.dash`.
-	5. The symbol surrounds the base, e.g. `plus.square`.
+    This can have the following meanings:
+    1. The symbol is added around or inside the base as a subordinate (smaller than the base),
+        e.g. `eq.quest`, `triangle.stroked.dot`.
+    2. The symbol is stacked below the base, e.g. `gt.lt`.
+    3. The symbol is stacked to the right of the base, e.g. `colon.eq`.
+    4. The symbol is overlaid at the center of the base, e.g. `integral.dash`.
+    5. The symbol surrounds the base, e.g. `plus.square`.
 - Notable exceptions to the previous convention:
-	- When `.eq` is used in the second sense (stacked below), it only adds a single line and not two,
-		e.g. `lt.eq`. For two lines below, `.equiv` is used, e.g. `lt.equiv`.
+    - When `.eq` is used in the second sense (stacked below), it only adds a single line and not two,
+        e.g. `lt.eq`. For two lines below, `.equiv` is used, e.g. `lt.equiv`.
 
 [^modifname]: Though a modifier can also just coincidentally be a symbol name, e.g. `.not`.
 
 ### Established Generic Modifiers
 These have a broad meaning and can have varying interpretations.
 <!-- Geometry -->
 - `.l`/`.r`/`.t`/`.b`: The four main directions (left/right/top/bottom), e.g. `arrow.l`, `times.r`.
-	- For delimiters, `.l` means opening and `.r` means closing, e.g. `paren.l`, `quote.r`.
+    - For delimiters, `.l` means opening and `.r` means closing, e.g. `paren.l`, `quote.r`.
 - `.tl`/`.tr`/`.bl`/`.br`: The four corners, e.g. `arrow.tl`, `triangle.stroked.tr`.
-	- Generally, these are used for a single, diagonal direction,
-		whereas combinations of two main directions (like `.t.l`) are used to mean both of them at once,
-		e.g. `arrow.t.l`, if it existed, would be a two-headed arrow that points both top and left,
-		similarly to how `arrow.l.r` is an arrow pointing both left and right.
+    - Generally, these are used for a single, diagonal direction,
+        whereas combinations of two main directions (like `.t.l`) are used to mean both of them at once,
+        e.g. `arrow.t.l`, if it existed, would be a two-headed arrow that points both top and left,
+        similarly to how `arrow.l.r` is an arrow pointing both left and right.
 - `.cw`/`.ccw`: Clockwise/Counterclockwise, e.g. `arrow.cw`, `integral.ccw`.
 - `.tiny`/`.small`/`.medium`/`.big`: A geometric shape with a certain size, e.g. `square.stroked.small`.
 <!-- Strokes -->
 - `.stroked`/`.filled`: A symbol that has an empty/filled interior, e.g. `circle.stroked`, `arrow.r.filled`.
-	(They correspond to Unicode's "white"/"black".)
+    (They correspond to Unicode's "white"/"black".)
 - `.dotted`: A shape with a dotted line instead of a full stroke, e.g. `circle.dotted`.
 - `.light`/`.heavy`: A shape with a certain stroke weight, e.g. `checkmark.heavy`.
 <!-- Other (in alphabetic order) -->
@@ -85,13 +85,13 @@ These have a broad meaning and can have varying interpretations.
 These have a specific meaning that is not open to much interpretation.
 <!-- (in alphabetic order) -->
 - `.big`: A [large](https://www.unicode.org/Public/math/latest/MathClassEx-15.html) (n-ary) version
-	of an operator, e.g. `union.big`.
+    of an operator, e.g. `union.big`.
 - `.inv`: Either vertically mirrored or a 180° rotated version of a symbol, e.g. `amp.inv`, `Omega.inv`.
-	- See also [#108](https://github.com/typst/codex/issues/108).
+    - See also [#108](https://github.com/typst/codex/issues/108).
 - `.not`: A negation of the symbol, e.g. `eq.not`.
 - `.o`: A symbol with a circle around it, e.g. `plus.circle`.
-	- See also [#62](https://github.com/typst/codex/pull/62)
+    - See also [#62](https://github.com/typst/codex/pull/62)
 - `.rev`: A horizontally mirrored version of a symbol, e.g. `in.rev`.
-	- See also [#108](https://github.com/typst/codex/issues/108).
+    - See also [#108](https://github.com/typst/codex/issues/108).
 - `.sq`: A "squarified" version of a symbol, e.g. `subset.sq`.
-	- See also [#110](https://github.com/typst/codex/pull/110)
+    - See also [#110](https://github.com/typst/codex/pull/110)