docs: fix a few spelling mistakes

Searched using cspell.

README.md

@@ -420,9 +420,9 @@ settings:
 
 A regex for packages should be treated as internal. Useful when you are utilizing a monorepo setup or developing a set of packages that depend on each other.
 
-By default, any package referenced from [`import/external-module-folders`](#importexternal-module-folders) will be considered as "external", including packages in a monorepo like yarn workspace or lerna emvironentment. If you want to mark these packages as "internal" this will be useful.
+By default, any package referenced from [`import/external-module-folders`](#importexternal-module-folders) will be considered as "external", including packages in a monorepo like yarn workspace or lerna environment. If you want to mark these packages as "internal" this will be useful.
 
-For example, if you pacakges in a monorepo are all in `@scope`, you can configure `import/internal-regex` like this
+For example, if your packages in a monorepo are all in `@scope`, you can configure `import/internal-regex` like this
 
 ```yaml
 # .eslintrc.yml

src/ExportMap.js

@@ -319,7 +319,7 @@ ExportMap.for = function (context) {
 
   const content = fs.readFileSync(path, { encoding: 'utf8' })
 
-  // check for and cache unambigious modules
+  // check for and cache unambiguous modules
   if (!unambiguous.test(content)) {
     log('ignored path due to unambiguous regex:', path)
     exportCache.set(cacheKey, null)

utils/ModuleCache.js

@@ -22,7 +22,7 @@ class ModuleCache {
   get(cacheKey, settings) {
     if (this.map.has(cacheKey)) {
       const f = this.map.get(cacheKey)
-      // check fresness
+      // check freshness
       if (process.hrtime(f.lastSeen)[0] < settings.lifetime) return f.result
     } else log('cache miss for', cacheKey)
     // cache miss