Fix misspelled words detected by codespell

Author: per1234

src/File.cpp

@@ -19,7 +19,7 @@
 */
 
 File::File(SdFile f, const char *n) {
-  // oh man you are kidding me, new() doesnt exist? Ok we do it by hand!
+  // oh man you are kidding me, new() doesn't exist? Ok we do it by hand!
   _file = (SdFile *)malloc(sizeof(SdFile));
   if (_file) {
     memcpy(_file, &f, sizeof(SdFile));

src/SD.cpp

@@ -25,7 +25,7 @@
      directories which simplifies interacting with files in subdirectories.
 
      Utility methods are provided to determine whether a file exists
-     and to create a directory heirarchy.
+     and to create a directory hierarchy.
 
 
   Note however that not all functionality provided by the underlying
@@ -290,7 +290,7 @@ namespace SDLib {
     file/directory with the associated file open mode property.
 
     Always returns true if the directory traversal hasn't reached the
-    bottom of the directory heirarchy.
+    bottom of the directory hierarchy.
 
     Returns false once the file has been opened--to prevent the traversal
     from descending further. (This may be unnecessary.)
@@ -399,7 +399,7 @@ namespace SDLib {
       // extract just the name of the next subdirectory
       uint8_t idx = strchr(filepath, '/') - filepath;
       if (idx > 12) {
-        idx = 12;  // dont let them specify long names
+        idx = 12;  // don't let them specify long names
       }
       char subdirname[13];
       strncpy(subdirname, filepath, idx);
@@ -424,7 +424,7 @@ namespace SDLib {
     }
 
     *index = (int)(filepath - origpath);
-    // parent is now the parent diretory of the file!
+    // parent is now the parent directory of the file!
     return *parent;
   }
 
@@ -557,7 +557,7 @@ namespace SDLib {
   boolean SDClass::mkdir(const char *filepath) {
     /*
 
-      Makes a single directory or a heirarchy of directories.
+      Makes a single directory or a hierarchy of directories.
 
       A rough equivalent to `mkdir -p`.
 
@@ -568,7 +568,7 @@ namespace SDLib {
   boolean SDClass::rmdir(const char *filepath) {
     /*
 
-      Remove a single directory or a heirarchy of directories.
+      Remove a single directory or a hierarchy of directories.
 
       A rough equivalent to `rm -rf`.