Update some colors to fix closeness.
Update some colors to fix closeness.

I have used syntactic color values with respect to the table below:

A | B C | D | E | F G | H | I | J K | L M | N O | P Q | R S | T U | V W | X | Y Z
0     1     2   3     4     5   6   7      8        9      A      B     C       D    E     F

For example for Gradle the color should be 4B0283, for Cuda the color should be 1C201C(for six-letter CudaCu) and for reStructuredText the color should be B3BCBC(for six-letter reStru).
tschf/linguist,meunierfrederic/octocatlinguist,pchaigno/linguist,stanhu/linguist,MostAwesomeDude/linguist,pchaigno/linguist,stanhu/linguist,osorgin/linguist,yyx990803/linguist,erkyrath/linguist,meunierfrederic/octocatlinguist,github/linguist,stanhu/linguist,christop/linguist,erkyrath/linguist,R4PaSs/linguist,sebgod/linguist,jtbandes/linguist,R4PaSs/linguist,c-lipka/linguist,stanhu/linguist,mwpastore/linguist,MahmoudFayed/linguist,mwpastore/linguist,steventhanna/linguist,pchaigno/linguist,MostAwesomeDude/linguist,JJ/linguist,JJ/linguist,ppaulweber/github-linguist,github/linguist,sebgod/linguist,github/linguist,steventhanna/linguist,JJ/linguist,yyx990803/linguist,tschf/linguist,sebgod/linguist,PsichiX/linguist,pchaigno/linguist,sebgod/linguist,osorgin/linguist,jtbandes/linguist,github/linguist,christop/linguist,yyx990803/linguist,erkyrath/linguist,MahmoudFayed/linguist,PsichiX/linguist,meunierfrederic/octocatlinguist,ppaulweber/github-linguist,yyx990803/linguist,JJ/linguist,erkyrath/linguist,c-lipka/linguist