[Rd] Mistype in CRAN mirror list(doc/CRAN_mirrors.csv) (PR#7759)

[mokada at md.tsukuba.ac.jp]

Full_Name: Masafumi OKADA
Version: 2.0.1
OS: Windows
Submission from: (NULL) (130.158.158.65)


In the list of CRAN mirrors($R_HOME/doc/CRAN_mirrors.csv), I found a mistyping.

Mirror in University of Tsukuba is described as "Tsukaba", not "Tsukuba".
I know "Tsukuba" is correct, because I'm webmaster of this mirror :-)

Current:
"Japan (Tsukaba)",Japan,Tsukaba,http://cran.md.tsukuba.ac.jp/,"University of
Tsukuba"
Correct:
"Japan (Tsukuba)",Japan,Tsukuba,http://cran.md.tsukuba.ac.jp/,"University of
Tsukuba"