Revise experience details in about.md

Author: zedware

about.md

@@ -8,15 +8,13 @@ I am Wenliang ZHANG (张文亮), a software engineer working on database and sto
 
 ### More Information
 
-I have worked on database and storage systems, written code with C, C++, Java etc. for many years.
-
-My random thought series: [AA](https://zedware.github.io/RANDOM-THOUGHT-AA/), [AB](https://zedware.github.io/RANDOM-THOUGHT-AB/), [AC](https://zedware.github.io/RANDOM-THOUGHT-AC/).
+I have worked on several database and storage systems, written code in COBOL, C, C++, Java, Golang etc. for many years.
 
 [My notebook on GitHub](https://github.com/zedware/notebook), including vim/emacs config files, shell scripts, gdb macros, sample code etc.
 
 [My Wiki pages on GitHub](https://github.com/zedware/notebook/wiki), pages on development environment and programming languages.
 
-[My ancient homepage](https://zedware.github.io/homepage), including articles on mainframe, programming languages and databases.
+[My ancient homepage](https://zedware.github.io/homepage), including articles on the mainframe, programming languages and databases.
 
 ### Contact me