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, 1 insertions, 1 deletions

diff --git a/src/dotgraph.cpp b/src/dotgraph.cpp
index bbffaf0..9b7ddb7 100644
--- a/src/dotgraph.cpp
+++ b/src/dotgraph.cpp
@@ -117,7 +117,7 @@ QCString DotGraph::writeGraph(
         EmbeddedOutputFormat ef,  // html, latex, ...
         const char* path,         // output folder
         const char* fileName,     // name of the code file (for code patcher)
-        const char* relPath,      // output folder relativ to code file
+        const char* relPath,      // output folder relative to code file
         bool generateImageMap,    // in case of bitmap, shall there be code generated?
         int graphId)              // number of this graph in the current code, used in svg code
 {