Correct spelling mistakes.

docs/markdown/Contributing.md

@@ -20,7 +20,7 @@ test run before they are even considered for submission.
 
 ## Tests
 
-All new features must come with automatic tests that throughly prove
+All new features must come with automatic tests that thoroughly prove
 that the feature is working as expected. Similarly bug fixes must come
 with a unit test that demonstrates the bug, proves that it has been
 fixed and prevents the feature from breaking in the future.

mesonbuild/dependencies/base.py

@@ -271,8 +271,8 @@ class ConfigToolDependency(ExternalDependency):
 
             out = self._sanitize_version(out.strip())
             # Some tools, like pcap-config don't supply a version, but also
-            # dont fail with --version, in that case just assume that there is
-            # only one verison and return it.
+            # don't fail with --version, in that case just assume that there is
+            # only one version and return it.
             if not out:
                 return (tool, 'none')
             if versions:

mesonbuild/environment.py

@@ -968,7 +968,7 @@ class CrossBuildInfo:
     def get_properties(self):
         return self.config['properties']
 
-    # Wehn compiling a cross compiler we use the native compiler for everything.
+    # When compiling a cross compiler we use the native compiler for everything.
     # But not when cross compiling a cross compiler.
     def need_cross_compiler(self):
         return 'host_machine' in self.config

test cases/failing/68 subproj different versions/meson.build

@@ -3,7 +3,7 @@ project('super', 'c')
 # A will use version 1 of C
 a_dep = dependency('a', fallback: ['a', 'a_dep'])
 
-# B will fail becuase it requests version 2 of C
+# B will fail because it requests version 2 of C
 b_dep = dependency('b', fallback: ['b', 'b_dep'])
 
 main = executable('main', files('main.c'), dependencies: [a_dep, b_dep])