overview.rst corrections

[acicovic]

Some documentation spelling corrections and improvements.

[codecov]

Codecov Report

Merging #710 into develop will decrease coverage by 0.06%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #710      +/-   ##
=============================================
- Coverage      68.84%   68.78%   -0.07%     
  Complexity      2049     2049              
=============================================
  Files            106      106              
  Lines           4825     4825              
=============================================
- Hits            3322     3319       -3     
- Misses          1503     1506       +3

Impacted Files	Coverage Δ	Complexity Δ
src/TableColumn/Status.php	73.52% <0%> (-8.83%)	12% <0%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #710 into develop will decrease coverage by 0.06%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #710      +/-   ##
=============================================
- Coverage      68.84%   68.78%   -0.07%     
  Complexity      2049     2049              
=============================================
  Files            106      106              
  Lines           4825     4825              
=============================================
- Hits            3322     3319       -3     
- Misses          1503     1506       +3

Impacted Files	Coverage Δ	Complexity Δ
src/TableColumn/Status.php	73.52% <0%> (-8.83%)	12% <0%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c20cc2d...ae90c76. Read the comment docs.

[DarkSide666]

thanks!