pages/common: fix typos in placeholders (#11949)

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/git-stash.md

@@ -19,9 +19,9 @@
 
 `git stash list`
 
-- Show the changes as a patch between the stash (default is stash@{0}) and the commit back when stash entry was first created:
+- Show the changes as a patch between the stash (default is `stash@{0}`) and the commit back when stash entry was first created:
 
-`git stash show -p {{stash@{0}}`
+`git stash show -p {{stash@{0}}}`
 
 - Apply a stash (default is the latest, named stash@{0}):
 

pages/common/hyperfine.md

@@ -25,4 +25,4 @@
 
 - Run a benchmark where a single parameter changes for each run:
 
-`hyperfine --prepare '{{make clean}}' --parameter-scan {{num_threads}} {{1}} {{10}} '{{make -j {num_threads}}'`
+`hyperfine --prepare '{{make clean}}' --parameter-scan {{num_threads}} {{1}} {{10}} '{{make -j {num_threads}}}'`