chore: fix some typos in comment (#2286)

Signed-off-by: hongkuang <liurenhong@outlook.com>

Author: HongKuang

overlays/haskell.nix

@@ -353,7 +353,7 @@ final: prev: {
               #    urls there will allow us to know from where to fetch the packages tarballs at build
               #    time.
               # 3. We don't want to leak the nix path of the index into the derivation of the component
-              #    builder since this will cause unnecesary recompilation. In other words, the recipe to
+              #    builder since this will cause unnecessary recompilation. In other words, the recipe to
               #    compile a package has to only depend on its content, not on where the recipe is from
               #    or how it is obtained.
               #

overlays/musl.nix

@@ -33,7 +33,7 @@ final: prev: prev.lib.optionalAttrs prev.stdenv.hostPlatform.isMusl ({
   # See https://github.com/input-output-hk/haskell.nix/issues/948
   postgresql = (prev.postgresql.overrideAttrs (_old: {
       dontDisableStatic = true;
-      # the following is needed becuase libicu links against stdc++
+      # the following is needed because libicu links against stdc++
       NIX_LDFLAGS = "--push-state --as-needed -lstdc++ --pop-state";
       # without this collate.icu.utf8, and foreign_data will fail.
       LC_CTYPE = "C";

test/githash/default.nix

@@ -42,7 +42,7 @@ let
 
 in recurseIntoAttrs {
   # githash runs git from TH code and this needs a cross compiled git exe
-  # to work correctly.  Cross compiling git is currently brocken.
+  # to work correctly.  Cross compiling git is currently broken.
   meta.disabled = __elem compiler-nix-name ["ghc901" "ghc902"] || haskellLib.isCrossHost ||
     # TODO find out why TH fails for this
     (__elem compiler-nix-name ["ghc927" "ghc928"] && stdenv.hostPlatform.isAarch64 && stdenv.hostPlatform.isMusl);