Fix typos and linguistic errors in documentation / hacktoberfest

[survivant]

Fix typos and linguistic errors in documentation. It's not much, but I'm happy to help

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.1%. Comparing base (fa8e48b) to head (959dd01).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #7494   +/-   ##
=====================================
  Coverage   86.1%   86.1%           
=====================================
  Files        291     291           
  Lines      25615   25615           
=====================================
+ Hits       22056   22059    +3     
+ Misses      3186    3183    -3     
  Partials     373     373           

Files with missing lines	Coverage Δ
attribute/encoder.go	85.0% <ø> (ø)
exporters/stdout/stdoutmetric/encoder.go	100.0% <ø> (ø)
internal/global/meter.go	99.0% <ø> (ø)
metric.go	66.6% <ø> (ø)

... and 2 files with indirect coverage changes

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[survivant]

if you want can you add this label to this PR : hacktoberfest-accepted :)

[flc1125]

hacktoberfest-accepted

@open-telemetry/go-maintainers PTAL, Let's see if we need to add this label.

Some reference materials:https://hacktoberfest.com/participation/

Hacktoberfest is a global open-source contribution event organized by DigitalOcean every October.
Anyone can participate by submitting pull requests on GitHub or GitLab, and as long as they meet the event’s rules, they can earn rewards such as digital badges or limited-edition T-shirts.

Some information from the community: https://github.com/topics/hacktoberfest-accepted