Fix typos

Author: sylvestre

src/macros.rs

@@ -2,7 +2,7 @@
 // considering datetime varitations
 //
 // It replaces the modification time in the actual diff
-// with placeholer "TIMESTAMP" and then asserts the equality
+// with placeholder "TIMESTAMP" and then asserts the equality
 //
 // For eg.
 // let brief = "*** fruits_old.txt\t2024-03-24 23:43:05.189597645 +0530\n

tests/run-upstream-testsuite.sh

@@ -19,7 +19,7 @@
 # By default it expects a release build of the diffutils binary, but a
 # different build profile can be specified as an argument
 # (e.g. 'dev' or 'test').
-# Unless overriden by the $TESTS environment variable, all tests in the test
+# Unless overridden by the $TESTS environment variable, all tests in the test
 # suite will be run. Tests targeting a command that is not yet implemented
 # (e.g. cmp, diff3 or sdiff) are skipped.