Fix typos

Author: tirkarthi

book/07-git-tools/sections/revision-selection.asc

@@ -120,7 +120,7 @@ You can see your reflog by using `git reflog`:
 ----
 $ git reflog
 734713b HEAD@{0}: commit: fixed refs handling, added gc auto, updated
-d921970 HEAD@{1}: merge phedders/rdocs: Merge made by the 'recursive' stategy.
+d921970 HEAD@{1}: merge phedders/rdocs: Merge made by the 'recursive' strategy.
 1c002dd HEAD@{2}: commit: added some blame and merge stuff
 1c36188 HEAD@{3}: rebase -i (squash): updating HEAD
 95df984 HEAD@{4}: commit: # This is a combination of two commits.

book/B-embedding-git/sections/go-git.asc

@@ -2,7 +2,7 @@
 
 (((go-git)))((("Go")))
 In case you want to integrate Git into a service written in Golang, there also is a pure Go library implementation.
-This implementation does not have any native dependencies and thus is not prone to manual memory managemen errors.
+This implementation does not have any native dependencies and thus is not prone to manual memory management errors.
 It is also transparent for the standard Golang performance analysis tooling like CPU, Memory profilers, race detector, etc.
 
 go-git is focused on extensibility, compatibility and supports most of the plumbing APIs, which is documented at https://github.com/src-d/go-git/blob/master/COMPATIBILITY.md[].