Spelling corrections for src directory

Spelling corrections as found by codespell and in #561.

Some reported problems were already fixed, others are fixed here, with some exceptions (a,o.):
- "referenceby" in defgen.cpp as this is in the output and I cannot oversee the consequences (looks like none, but ...)
- "HANGEUL_CHARSET" left as is as in some MS documentation is written: 'HANGUL_CHARSET: Also spelled "Hangeul". Specifies the Hangul Korean character set.' (https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-wmf/0d0b32ac-a836-4bd2-a112-b6000a1b4fc9).

1 files changed, 2 insertions, 2 deletions

diff --git a/src/sortdict.h b/src/sortdict.h
index 0e0b5c1..203ae5e 100644
--- a/src/sortdict.h
+++ b/src/sortdict.h
@@ -244,7 +244,7 @@ class SDict
       return m_list->find(item);
     }
 
-    /*! Equavalent to find(). */
+    /*! Equivalent to find(). */
     T *operator[](const char *key) const
     {
       return m_dict->find(key);
@@ -553,7 +553,7 @@ class SIntDict
       return m_dict->find(key);
     }
 
-    /*! Equavalent to find(). */
+    /*! Equivalent to find(). */
     T *operator[](int key) const
     {
       return m_dict->find(key);