Correct some typos (#987)

README.md

@@ -151,7 +151,7 @@ typst --font-path path/to/fonts compile file.typ
 # Lists all of the discovered fonts in the system and the given directory.
 typst --font-path path/to/fonts fonts
 
-# Or via environement variable (Linux syntax).
+# Or via environment variable (Linux syntax).
 TYPST_FONT_PATHS=path/to/fonts typst fonts
 ```
 

library/src/layout/par.rs

@@ -1280,7 +1280,7 @@ fn commit(
         }
     }
 
-    // Determine how much addtional space is needed.
+    // Determine how much additional space is needed.
     // The justicication_ratio is for the first step justification,
     // extra_justification is for the last step.
     // For more info on multi-step justification, see Procedures for Inter-

tests/typ/layout/par-justify.typ

@@ -27,7 +27,7 @@ D E F #linebreak(justify: true)
 #""
 
 ---
-// Test that the last line can be shrinked
+// Test that the last line can be shrunk
 #set page(width: 155pt)
 #set par(justify: true)
 This text can be fitted in one line.

tests/typ/text/linebreak-obj.typ

@@ -5,7 +5,7 @@
 #set page(width: 162pt)
 
 They can look for the details in @netwok,
-which is the authorative source.
+which is the authoritative source.
 
 #bibliography("/works.bib")